bitcoin's value is based on its monetary properties and less on its technical qualities. as long as it functions as advertised then 'good enough' is a powerful incentive to keep refining it. it only has one job to do.
ethereum is of course huge too, but its fundamental value proposition is utility. it's effectively a software platform, not money.
since that's the case then is the case for it being usurped by something that does the job better higher than bitcoin?
if something that doesn't require learning a new language, is much more foolproof, that addresses scaling and blockchain bloat comes along with enough oomph does it have a shot at unseating ETH or is everyone now incentivised enough to make ethereum the one?
personally i don't think ethereum's future in fully in the bag and people are learning more and more every day. what do you think?
I also think that ETH can not fail. Because if it would fail this would mean that all ETH based projects will die. This would be end of crypto.

it can be a big problem if the eth fails, but I will not be sure if eth fails. eth can be a good bitcoin companion coin in cryptocurrency and have a nice future for price and sales