There are many possible future worlds. Obviously I'm not speaking of possible futures in which a magical FAI can do anything you ask of it.

A sizable fraction of possible futures may contain AIs for which solving these problems are trivial, or societies with so much wealth that they can mount massive research projects for charity or fun. But the fraction of those possible futures in which reviving frozen humans is thought of as an admirable goal might not be large.

My point estimate is that, if you wanna get revived, you have to get revived before the singularity, because you're not going to have much value afterwards.