Just because the masses are batting an eye into Defi, NFT, and any dAaps supporting cryptocurrencies, does not mean highly privacy-centric coins will cease to exist. Each cryptocurrency has its own purpose, if there is enough of absurd people that flow their wealth into shitcoins, then those particular privacy coins will have its own benefit and it actually has the real utilities according to the user needs. So, I don't see it will end anytime soon!