Do you mean "crack" instead of frack? Because otherwise, I am not sure I'm following you. Assuming you mean that, I think you are making a mistake in the argument. Yes, there are lots of coins in the wallets to which nobody currently has access. Yes, if these wallets are opened and the belongings are sold pretty much simultaneously with those from other wallets, it could be a big hit on the market. But no, it's not 100% clear that there'll ever be computers able to make it possible. And if we imagine there are some, then Bitcoin will have a much bigger problem: the whole thing makes no sense if the private keys can be obtained so fast. However, even this won't be the end of crypto per se, since even nowadays there're already some (at least, allegedly) quantum-resistant cryptos.