I don't think we'll see a mass awakening but I think as time goes on they will bleed out slowly. They will never be 100% gone, almost any organization never goes away 100%, there is always a foundation of members that support it.
I think as time goes on, more things come to light along with the internet we will see memberships dry up. They will start to get creative in how they count their members to show growth which I think they have already been doing with the 15 minutes and going by "peak" instead of what it actually is. They may hover around this number, slowly growing until they peak and have a steady decline where they eventually bottom out at a certain number that they will stay at.
One thing for sure is that the huge growth they once experienced will most likely never happen again.
Unless big changes come, only way I see this not happening.