Ethereum has built a strong foundation through the years and it has gained the trust of most investors so I don't think it would die just because of its high fees. It has passed through the tests of time and its improvements and developments are too visible. Ethereum still has a huge potential to boom in the coming days.
Not just by the investors but also those developers who continued to use this chain to build thier projects, it's a never stopped to improved and developed bringing more trust from more investors and traders, far from this idea of dying, this system will continue and will allow more developers and investors to enjoy the benefits of this well developed system.
There are many reasons why erc20 technology from eth is used more than others such as bnb, the factors may be more familiar and simple enough for developers to understand so if they are still dominant and trusted, it is likely that ethereum will not die while their technology is still dominant
It's way far from other chain that being developed and with well developed approach it's more trusted by those developers. They simply find this technology fits to their work and they'll stuck using it for the best outcomes of their works.