I think this should be considered conceivable, but not in the same realm of plausibility as cryonics working. If you rate cryonics chances of working low, this is much lower. If you rate its chances extremely high, this possibility might be in a more moderate range.

My favorite idea is to scan interstellar dust for reflected electromagnetic and gravitational data. Intuitively, I imagine this would lead first to resolving only massive objects like stars and planets, but with time and enough computation it could be refined into higher details.