RE: Peter possibly committing suicide, I think some form of that will happen. Death or losing his powers or major time line exile. I'm not convinced he's going to be responsible for the problems of this future, though -- thus far Hiro is actually far more responsible. Sure, Claire blames Peter for Costa Verde getting blown up, but that was actually Knox's fault. Don't kick the table into the kid, and then Sylar doesn't lose it.

The issue of immediacy is what's interesting to me. There is none. Clearly, the world is still there in one year, and in two, and then in three. Year four is a bit problematic, but I'm wondering how they can get across the scope of the problem when the solution today is keeping a secret, and therefore not terribly eventful.