If you say ETH is a bubble, then I think the entire Crypto market is a bubble, not any potential coin and will no longer work if the ETH is a bubble. So I advise you to give up this thinking, they negatively affect the market a lot.
Any crypto coin, as well as the us dollar, is a soap bubble. There is not a clear security of these coins to the real product, Value, precious stones or gold or oil. If the Fiat currency was secured by the gold reserve, then bitcoin would look very sad. And so today, almost all currencies are not provided with gold or silver.
I also think that almost everything in the worl is so-called bubble.
The price of gold and other assets can be easily manipulated by big investors.