>Bring a formerly healthy rat back, then we'll talk.
As the saying goes: That is like a terminal ill patient refusing to get into the ambulance because "I don't want to be in an ambulance here, I want to be in the hospital; call me when the ambulance is at the hospital, then maybe I'll get in."
About rat, you have a point, but there was recent experiment where cryopreserved rabbit kidney was successfully reimplanted and worked as intended. Also there was a recent brain preservation competition, and the winning method was shown by SEM microscopy to preserve very fine synaptic structure. You can google these things if you are interested (I won't post the links to avoid looking like a shill or a fanatic).
Looks like a better alternative to 20k$ (as was said earlier in this thread) euthanasia + perhaps 10k$ for funeral expense.
Consider how our current world would treat people from the 18th or 19th C. Would it be endless media titilation, Buzzfeed memes of 20 things you didn't know about Bob the Victorian? Would there be the discrimination akin to how we treat indigenous or third world peoples? Would we help Bob the Victorian to get fully up to speed with society, or just see a curiosity?
So, for now, I'm happy with my lot.