I literally just said:
Only if Bitcoin remains predominant.
Yes, Bitcoin still uses proof-of-work. That's because Bitcoin is itself a fossil, its userbase and developers have consciously decided to not adopt new blockchain technologies and remain locked in the current protocol. Other blockchains have continued moving on. Alas, Bitcoin has name recognition and inertia on its side, which will keep it around for a long time. But at some point I expect its obsolescence will catch up with it and overcome that inertia.
Ether has a market cap of $450 billion, and that doesn't count all the other tokens running on the Ethereum blockchain. It's been running since 2013. If you call that a "boutique coin" based on "pump-and-dump" then clearly you've either got a highly biased or highly ignorant view of cryptocurrency.
There are technical flaws in Bitcoin that could literally crash it if they aren't patched out before they become exploitable, as in it's at zero value and will never recover. That's not something that can happen to gold.