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.
Everything in this market is a bubble.
As the stock market is, as the "real" money is.
A bubble. The difference stands in who's blowing and filling the bubble. Stock markets' and real currencies' bubbles have billions of people blowing air into, while cryptos' bubble doesn't. One day it will, but a bubble was and a bubble it will remain