This kind of statement gives me great hope, and in particular represents the kind of fundamental mindset change that helps counter many of the painful aphorisms commonly pulled out when someone dies. I find it deeply unfortunate how rarely it applies, but as mentioned elsewhere in the thread, it applies here. Thank you.
But, as someone who plans on being cryo-preserved eventually, I'd say that whatever chance there is of reviving whatever remains of this individual, it should be taken. I'd want to live in the future, even if that meant not having my full cognitive abilities. Maybe not as very cognitively-impaired individual, but I guess I'll put that type of stipulation in the contract if I was worried about it.
Everything eventually ends, I don't see the appeal in pushing that only to suffer.
It is possible to lose an entire brain hemisphere and retain complete functionality (see https://en.wikipedia.org/wiki/Hemispherectomy).
There is a huge amount of redundancy in the brain, and most brain matter is only concerned with I/O, signal processing, and life support. It's one of the reasons I have a lot of hope that cryonics is feasible -- massive loss of brain tissue need not mean irreversible loss of an individual.