I don't agree that CoH is worth saving, but I think a new online - or at least co-op - superhero game done right would go over exceedingly well. I'm acutally surprised there haven't been more attempts given the popularity of comic books/movies and games like Bats AA/AC these days. The market is definitely there for it.
"We choose the right to be who we are. We know the difference between the reality of freedom and the illusion of freedom."