Nothing is impossible of course, but realistically speaking it will be hard to surpass Bitcoin anyway. It could happen though because there is some intrinsic incentive to it. If Ethereum gets closer, there could develop something similar to self-fulfilling prophecy. The closer Ethereum gets, the more the people are excited to see Ethereum surpass Bitcoin.
BTC price stagnant, if BTC keep increasing and reaches $100K like people speculated, then it's gonna be even harder for ETH, BTC market cap could go up and down very drastically within short amount of time.
replaced by ETH but we cant also deny that ETH is really a good altcoin which did really have that significance into its existence.