Except that it shouldn't be a question of BTC or a regional bank, but rather BTC or the currency held in a bank. Then it's a question of which bank. I'll stick with banks. Fortunately, here in Canada, our banks are quite stable.
I live in Canada, am happy with my BMO and TD deposits. I in particular spoke of a large number of undercapitalized US regional banks. There is a reason the US regional Bank index tanked almost 8%. And I disagree with your statement. The last thing people want is have their deposits locked up for weeks or months before any of that mess is sorted out. Especially for those who deposit more than 250k.
This has nothing whatsoever to do with credit risk. Those are deposits, zero credit risk against the bank in question involved. Even if the bank goes under the deposits are not exposed to the credit risk of the bank. Depositors are at most exposed to market risk.