I'm simply unconvinced that a run because of bitcoin is possible. You'd be talking about a mass failing in fiat that would cause everyone to run to crypto. How does that happen? Only if nuclear war happens or something really huge that causes the dollar and other currencies to fluctuate even more wildly than btc.

It's obvious that fiat is a lot more stable than btc when it comes to price. So that's why people won't honestly keep daily money in crypto. They'd keep it in fiat. they'd keep their "savings" in btc though. This is why there can't be a run on banks for bitcoin unless bitcoin stabilizes in price... which is never happening.