Why would anyone who is perfectly healthy go through this process consciously. I mean the theory is great but it really does make sense for some to opt for this if they suffering from an incurable disease and are hoping that some day in the future they may be revived when there is a cure available.
Anyways if you believe in life after death then I would rather take on a new body than to keep myself in a limbo for an unknown amount of time ;)
Yes, people either sign up to get this procedure done when they're about to die, or when they already know they're terminally ill. No healthy person would do it on purpose.
And yes you're right, starting a new life in a new body would actually be much better than being frozen and having the risk to never wake up at all