I don't see bitcoin showing any signs of breaking down or slowing down such that Ethereum would surpass it so easily???
Lets remember that the limited supply of bitcoin makes btc super precious and valuable and it's value will go up with time and by the way I hate we have the pandemic but should it end or continue people would be more inclined to use digital channels for thie financial use and maybe stash some of their monies in crypto to avoid governments prying eyes and all this means btc will be bullish and price will go up ,so will its market cap.
If Ethereum scales strongly and maybe even more than most investors expected, I think it is not impossible. Out of a sudden all applications would have the perfect platform to go to and that might drive the price up a lot. When full POS is rolled out with more scalability solutions and there is an ever-growing need for gas it is very attractive for investors to hold onto Ethereum.