I actually wish it disappeared. It would make a lot of people more productive (me included) and allow me to not worry about writing a facebook app.

This is like a negative network effect where so many people are sucked into this black hole that it's hurting everyone.

I'm exaggerating a bit but I do see a negative effect. It may be outweighed by the positives but it's still there.

That's an interesting exercise, but in reality I wouldn't expect enough of my friends to pay to stay on. There would be a mass drop in the number of users, significantly devaluing my membership. So if that were to happen, I wouldn't pay anything. However, if they said "We're now at even cash flow, but have amassed a lot of debt! We don't intend to take this towards profitability, but please help us stay afloat." I might donate 10 or 15 bucks. Not that I expect that to happen either :-)