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.
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.
In the case that happened I will keep holding my bitcoin no matter what, however I will not deny that it will be incredibly disappointing to see this happening, however as unlikely as it may seem I cannot deny there is a chance that happens.
After all if people are still investing in all kind of shady projects even after the huge amount of icos that we saw getting millions of dollars just by copy and pasting a white paper and then exit scam their investors just a few years ago then I do not know what is it going to take for those investors to stop putting money in those scams.