I would go for that myself. Alzheimer's has shown up in my family medical history now (namely, my father), so I have to take that into consideration for my personal plans.

I define the goal of cryonics as turning death from a permanent off-state into a temporary off-state. I think it defeats the purpose of cryonics for cryonicists under current conditions to try to live as long as possible before their suspensions. We still don't have ways to protect the aging brain; rising health care costs could easily wipe you out financially; and you could wind up in a situation where someone hostile to cryonics has to assume power of attorney for you and will keep you from getting suspended any way, despite a lifetime of cryonics advocacy, as happened to Marce Johnson. No, better to enter the off-state a decade before any of that happens, and hope that future medicine can figure out how to reverse you from it.