SOPA will go way beyond preventing piracy, which it won't be very effective at doing. The effect will be removal of any site that is even suspected of having a single link to infringing material. Proof is not required. Mere suggestion that it could have a link is enough--meaning the Washtowel Babble and Crap Slaveholdery could knock out all apostate web sites merely by claiming that they have copies of old rags that are copyrighted, or links to such copies. That will give the Washtowel Slaveholdery the upper hand on anyone that is seeking information about the religion, and people will be joining the cancer to find out about it like they did in the mid and late 1980s.
It will also restrict your freedom to speak out against the Establishment. User uploaded content will be suspect of having links to "infringing material" and will have to be heavily moderated or shut down. Most sites will choose to shut down, especially if SOPA and not PIPA passes (SOPA adds the ability to get sued, not just shut down, for infringing material). Alternative news media and health sites will be eliminated through this--all it takes is for the big drug companies or CBS to cry "infringement", and the sites get shut down (and, under SOPA, sued).
Additionally, it will restrict online businesses. All Walmart needs do is claim that Battery Junction or L.L.Bean is "infringing" on some tiny detail, and their sites get pulled down. They don't need to prove the infringement--a claim is enough. Fine businesses like Stonewall Kitchen, L.L.Bean, Battery Junction, Christmas Lights Etc, 1000 Bulbs, and Tiger Electronics will face these claims from Walmart, Target, Morgue Stanley, and Best Buy. This will limit your ability to get good products--I myself use those would-be affected companies to buy batteries, flashlights, chargers, clothing, electronics parts and tools, decent food preparation products, light bulbs, and Christmas supplies not available at Walmart and Home Dumpot. I would rather spend the extra money--which is soon to become toilet paper anyways--now, on quality, than save it now by buying rubbish and having to replace it after my money becomes worthless.
Another unexpected effect is it will narrow your entertainment choices. You have a small-time band, and wish to post a video on YouTube to bypass "Clear(??)"Channel radio. So you perform it, only to find YouTube is shut down because they cannot prevent the tiniest chance of "infringing content". Or, your video has a note (yup, one single note) that matches a note on a copyrighted song. So, the record labels or "Clear(??)"Channel radio sues for infringement on that note. While under normal law it will do nothing, under PIPA it will get your video pulled down and the site closed down. Under SOPA, the site will also face getting sued. Jail time is also a possibility if they feel like pursuing it.
Which could lead to even worse. With alternative sources for music shut down (even iTunes and Rhapsody could be shut down for allowing some limited sharing and/or samples to be played without buying the songs), you are limited to the radio. They quit any pretense of entertainment and just play rubbish all the time. Maybe even one song--the Ingrid Michaelson Everybody Everybody song, which to me is complete rubbish, comes to mind--all the time. Just because people no longer have the option of getting their music online or buying new MP3's. While SOPA will not stop you from playing existing MP3's you own, it will stop you from playing streaming content or renting songs from Rhapsody (as tethered downloads). Once your license expires, that's it.
Instead, to buy a song, you need to buy a physical CD. And it will not be like the CDs you got in the 1990s. You will need a special player, and there will be a "huge catalog of more than 800 CDs" to choose from. "More than 800 titles--probably not much more. They will be all rubbish. No more of the hot titles like Saturday Night Fever, Thriller, Rumors (Fleetwood Mac), Led Zeppelin's boxed set, The Eagles Greatest--just the crap that got forgotten for good reason. You will buy the CD, and get the "right" to play it a limited number of times. If you skip around, each time you start the disc anywhere on it, it uses up a play right. Attempting to copy it onto another format (MP3, mini disc, cassette, or another regular CD) will result in the snitch chip in the CD you are trying to copy deactivating your right for that disc and any other discs under your ID.
All this, because they can get away with it. Why carry a catalog of 12 million CD titles when you can just get the 800 or so cheapest and crappiest CDs, get the license to sell them, and charge 500 toilet papers or more for a single disc with a mere 5 play rights per disc? And, the artists would get virtually nothing--the Rothschilds would end up getting virtually all the money. All because the competition is knocked out--once you knock out the competition, it is only a matter of time before it degenerates to this level. And, with the United Tyranny of Stupidity preventing new businesses from starting up (anyone trying to sell the other 11,999,200 CD titles will find they cannot get licenses to do so, and anyone trying to sell regular CDs with unlimited play rights and fair use rights will also find they can't get licensed in the United Tyranny of Stupidity).
Thus, in the name of stopping people from stealing music online (which it will not do, since people will find illegal software to do it anyways, at higher risk of getting worms), commerce will be limited to Walmart and whatever supermarkets Morgue Stanley manages to buy out. Information will be restricted to what the Establishment wishes you to see, including restricting apostate forums and web sites. Alternative media will be wiped out. And alternative sources for music (Internet Radio and the legal downloading sites for music and movies) will be shut down using some obscure portion of the law. Leaving customers with no choice but to buy whatever rubbish the established businesses wish to sell.