Those things are pretty unlikely to happen. Being backed by Bitcoin means that with every fiat transaction BTC will still remain somewhere in the national storage and this transaction won't influence the demand in BTC and crypto market in general. At the same time we need BTC to have a larger trade volume and MC to be able to represent at least something outside crypto market. BTC is too weak to back national currencies and nothing tells us that it would ever become strong enough.
What decentralised network has more hashing power than btc ? what are you talking about don't make sense.
BTC is too weak to back national currencies and nothing tells us that it would ever become strong enough
how weak ? what do you mean that ?