I admit my biology is a little rusty, but does the current process of freezing people mean there will never be a future technology to revive them? Our technolo

I admit my biology is a little rusty, but does the current process of freezing people mean there will never be a future technology to revive them? Our technology has progressed enormously in the last 300 years and most likely will continue for another 300 years. So to me cryonics seems to be a reasonable investment.