I got to agree that there are some better than Ethereum, tech wise, platform wise etc. But no ETH won't die. They are first to market and what we often see in economics is that the first to market has an advantage, simply because they're first. They might lose some of the market share to others but overall summing everything up in that category they will relatively hold the largest market share. Now this industry is quite new so some historical events might not replay accurately as what we're used to.

Market share in 2020: (example)

Ethereum 30%, Waves 15%, Lisk, 10%, Stratis 20%, Neo 20%, all others combined 5%.

As you can see Ethereum's market share sharply declined but remains dominant relatively to others. So this is just a little example that shouldn't be taken serious except for the point it try's to illustrate. And yes I know I left out some like Qtum, again just an example to illustrate.