Ethereum can drop under 100 dollar again but price is not everything, it can drop or pass 100 dollar it is normal in bad bear market conditions. Also I don't think ethereum can die, it is strongest altcoin for market.
You strongly agree with your opinion, a good altcoin is not only seen in terms of price or trading volume.
there are many communities, the holders and investors who hold the altcoin are another reason why an altcoin is said to be good.