The org has a certain inertia and is also very adaptable. The worldwide web has been around for 25 years now, and has made a dent in the membership, but not a crippling one. It is true that the internet makes it easier to leave than it used to be, and easier for potential new recruits to find out TTATT, but JWs give birth to more JWs - even if only one third of them stay in, that still keeps the machine running.
The loss of revenue from printing took a blow when they had to stop charging for literature. Since then, printing won't have been as profitable - by going paperless they can save money. The rank and file can now be asked to donate the money that they were using for literature to KH building projects. This not only keeps the money coming in, it also serves as an investment - unlike literature which just gets thrown away, the society can keep the buildings and later on consolidate/downsize/liquidise as needed (maybe even hiring out halls would be a future option).
Ever since I left, there have always been some ex-JWs who have speculated that the org is about to crumble, but I don't see any convincing evidence of that. I think it will either die out or go more mainstream eventually, but it will be a long drawn out process, and I don't expect it to seriously dwindle in the near future.