There is a lot of shilling lately (again) with "the flippening" event happening. Ethereum has created a new market which is basically 99% scam tokens, rugpulls, pump and dumps and NFTs which are probably used for money laundering. Anyway, the thing is, there is definitely if a demand for all of that, even if it's all based on a platform that's not decentralized.
The thing is, this so called Flippening didn't happen. There has been some noise back in 2017 that Ethereum will take over. And with the current state of gas fees in Etheruem market, I doubt that it will simply overtake bitcoin.
So to the point: Would you quit if a centralized shitcoin managed to surpass Bitcoin in marketcap? At that point it would be clear that entire space is a joke. Bitcoin would still march on as usual, but it would be just sad to see people putting their money on shitcoins rather than on the only actually decentralized blockchain worth anything.
No, bitcoin can't be surpassed, it's too big to fail now, not even Ethereum, or any shitcoin for that matter. As a prime mover,
BTC has the support not just from this community, but globally. Government, companies, institutional investors are all over bitcoin right now.