That the one entrepreneur can’t make it work doesn’t mean that it’s impossible:
Sir James Dyson is pulling the plug on his flagship electric car project after two years of work because it is not commercially viable.
For that’s rather the point of having markets and competition, that many people try to solve the same problem.
But let’s say that it does mean that the solution is non-obvious. Which does rather mean that this idea that we’ll stop producing ICEs by 2030, or 2040, whatever the target is, is looking a bit hopeful.