Even if it works(dehydratating and so on) I really do not think this is a good idea. Imagine you wake up after 100-200 years. All of the people you loved would be already dead. You will be alone and it is highly probable that you will live in a world completely different from your own. Look only about 100 years ago... Do you think an aristocrat (for example) from the end of XIX century could live in this world... Does it worth the risk? After all the death comes to us sooner or later. Trying to outsmart it never leads to anything good.

It's more complicated when it comes to a dying person who has not chances of survival... But this choice also has many disadvantages.