The BIS estimates 2.2 trillion dollars trade every day. That is daily trade volume, not the amount held in accounts. I mentioned the subject of liquidity to a bitcoin fanboy and they had no concept of what that meant in real world trading or transactions. The number of credit transaction per day is huge. The transaction rates per hour/day are massive.
Bitcoin is a TOY for crypto nerds and gold bugs. It would crash and burn if it had to support if even a small fraction of currently used currencies and payment types used it.
Because bitcoin is a crypto nerd experiment, it has FATAL FLAWS in it’s design that prevent it from being used in a serious manner. Modern coins do not. When those come out, Bitcoins will crash and burn and be worth zero. Enjoy the ride, however short that may be. Don’t be the one without a chair when the music stops.