If the world is to flee into a digital asset, Bitcoin just isn’t going to cut it. Bitcoin is difficult to transact. It’s difficult to trade without a third party taking custody. Mining is energy intensive and physical centralized. It hardly suffices for that role at this time.

If this were to happen over night, probably BTC and ETH. With greater flows to ETH/SOL/L2s over time- faster txs, smart contracts, deep dev communities. BTC would be around as a stable coin or bond type asset at that point.