I believe that ETH is not a bubble, neither is bitcoin. ETH has a strong public support, a strong concept has technology, it's one of the most popular coins that won trust of the users and this is why it's not a bubble. As for bitcoin I don't understand why you consider it a bubble. Probably you heard it somewhere from so-called experts but all of such statements just target to undermine bitcoin's "reputation" in people's minds to artificially drive it to "death".