Very true! There certainly should be enough room for both. With all the time and money invested in ETH I can't see it ever falling off, especially with Institutional investors starting to step in now as well.

It is really funny how it seemed every few months in 2018/2019 there was some project with high throughput/low gas fees/some technological advancement that was instantly christened an "ETH Killer". I think the coins that come on to "Kill ETH" like you said are just small improvements that in reality just help it develop more, there's certainly a place for all coins.