They will initially but just as we saw the the early internet, a crash can wipe out the speculation pretty efficiently and what remains might actually be useful.
Bitcoin has now been around for, what, 13 years? And aside from a very brief explosion of hype around NFTs that most people were fairly quickly able to recognize as nothing but more "greater fool" scams, most people not directly financially invested in blockchain projects either don't know or care blockchain exists, or see it as a bad thing.
Some stocks crashed, some specific sites went away, but the people involved just reorganized and made even more successful businesses.
If 50%+ of Internet users decided to disconnect that could cause some real problems.
The poster I was responding to thought that would make room for more pragmatic applications but I'm not so sure.
I'm not convinced that crypto is like the dot-com bubble. With the early web, its use cases were fairly clear and immediate. With crypto, the use cases remain unclear and speculative even after 13 years of hype and fanfare.