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I think anyone is welcome to try this, but the core ethos of the web is backwards compatibility. To my unending irritation, even non-standard behaviors/APIs like WebUSB have become critical for sites to function.
The last time we actually dropped a feature, it was Flash, and that took a decade and there is still tons of effectively dead/permanently lost content because of it.
Creating a browser that only implements a subset of the standards is fine for very niche usecases but I don’t expect it to ever overtake the major browsers. We’ll see how Ladybird fares as it’s compatibility increases.
Maybe not at the moment, but my understanding is that the pool of qualified C programmers is shrinking rapidly, because the old guard is all ageing out and there simply are not enough intermediate developers coding in C at the level that Kernel development requires.
Having a larger (and growing) pool of upcoming developers interested in systems programming and software excellence is one of the explicit stated reasons that Linus et al. considered Rust in the first place.