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You're essentially making a bet that someone will find something useful to do with a frozen brainSomething is deeply wrong with this way of thinking: it doesn't value human life at all.
Here's another version. Someone comes to you seeking for help. He's dying. He could be saved by some recently devised miraculous medical procedure, which would return him to full health. The catch is, that procedure is relatively expensive (let's say a few weeks worth of your own salary). Question: would you let him die?
Put it this way, of course not. But we tend to forget that cryopreservation, if it works, is exactly the same.
See, a preserved person, provided she can actually be reconstructed back to life, is not actually dead. She's mostly dead. There's a difference. Think of it as a very deep coma. So, if we ever devise a proper reconstruction procedure, we have two choices: (i) pay for the procedure and heal that patient at last; or (ii) don't pay and let the patient drift into utter annihilation.
Heal or don't heal. It's that simple.
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Now maybe you assume a frozen brain is not a living person. Maybe you're right. Maybe the preservation wasn't good enough on this particular brain. Maybe the preservation procedure was flawed to begin with. Maybe the brain doesn't hold enough information about a person to begin with. Maybe we won't find the technological means to actually get the brain back to its old state —even if it's theoretically possible. Maybe we won't be able to fix whatever caused the brainwaves to go flat in the first place —if that's fixable even in theory, see Alzheimer. I'm sure I've forgotten lots of ways this could go horribly wrong. Anyway, if any of this is true, that frozen brain can't be recovered, does count as dead, and you'd be right to call it a "frozen brain" instead of a "patient".
The thing is, to the best of our current knowledge, the odds are not nil. They're not good, but they're not nil. There is a chance that the brain is actually alive —I mean, in some real deep coma. I'm not talking about some abstract hope here, but some actual probabilities of the kind you have for experimental drugs on cancer patients. Slim, but real.
And of course, if we somehow come up with an actual reconstruction procedure, if we somehow can examine the brain and be assured that yes, a return to full health is not only possible, but highly probable, then we'll know that brain was alive all along. That it was a living person in dire need of healing.
Surely the people of the future would be willing to pay for such healing? If not strangers, maybe (distant) relatives? Some philanthropist? The transhumanist community? Government or mutual funds? Today, people pay good money to give Kim a very slim hope of living again. In what kind of bleak world would no one be willing to pay for a probable return to full health?