This says it all:

When I think of something like bitcoin, I think of how valuable it is: transparent, immutable, borderless, open, programmable sound money. The positives go on and on.

Although I don't think FIAT is going to disappear overnight - the dollar may well collapse completely, and I really feel for the 99% of Americans who aren't protected against that, but I imagine another currency will just take over, or maybe more than one - as the global reserve currencies.