I think you are being very pessimistic about this. Reddit’s collapse will not be a linear process. If it happens mind you.

But if it happens:

• First the most active 3% leaves. But the 3% creates a huge hole in the overall activity of the site. So another 3% leaves. And the site will at an ever increasing speed reach the point of no return. Reddits main user base is the drooling masses who want to read gossip instead of working.

But if there is no free entertainment, the masses just move on. Basically all a platform is, is it’s core audience.