Everything possible in crypto investment. LUNA and FTX has giving us a big lesson, we can't trust no one in this kind of investment. So, just don't be greedy and never spend money you can't afford to lose. Crypto is very volatile.
If we refer to what you said, I totally agree that nothing lasts forever and it is possible that anything will happen because the name of investment is always associated with the worst risk, which is, of course, losing the invested funds because they are no longer worth it.
There have been experiences that have occurred, and this will certainly teach you to always do whatever might happen.
But in my opinion, and the possibility could be wrong, ethereum will certainly be different from what has happened because, until now, ethereum has been a highly sought-after asset and is the target of investors, so if there is even the slightest movement, someone will intervene to prevent it from happening. Ethereum is almost as highly coveted as bitcoin.