Luckily reality is easier than that. That's my Bitcoin centric perspective.
Since other chains like Monero with bigger blocks exist there is no need for BTC to ever increase blocksizes. And even in a world where fully custodial BTC can not be used to get into Monero, I certainly would use any coin that can gap the world between "white labeled" and "black free" markets. So what I say is that in that scenario even shitcoins will have value in the future for those who seek maximum privacy on-chain.