People may riot a bit, but police will smack them down. You can't take money even if you break in, as it's all digital with only a little reserve to pay out in liquid cash. If people tried to take it out at once, the whole bank would fail from being insolvent.

Crypto may not be a dead-ringer solution indeed... It might flop and go down with the hype over :/ But in maybe 5 or 10 years it will be a whole different story relative to the existing financial system...