.. eventually going bust and being bought by Oracle?
I think that's the point. Existing cryptocurrencies are very likely to get eclipsed by new competitors that actually solve the problems people face with them. And if you want to have a big impact on humanity, solving those problems is a fruitful area. The financial system that'll pay for our retirements likely hasn't been invented yet.
Crypto is not the internet in 1996. It's a scam. The internet never was. "Crypto is the early internet" is such a lame over-repeated phrase by crypto enthusiasts. Doesn't make it correct in any way.