Although your suggestion may be popular, it is, in fact, suboptimal.
If one believes that "JS is the worst thing to happen to the web" and that "some other language would miraculously solve all of the problems" then going off into the wilderness to "create" is almost certainly a dead-end endeavour. A language is only one component of what's needed to replace JS - there's also winning over 4 major browser vendors who've dumped no trivial quantities of money, time, and PhDs into polishing this particular turd.[0] Then there's the standardisation peeps and so on. It's not so much a technical challenge - many existing languages could add support for DOM APIs and become an in-browser candidate relatively trivially - but a political one. And when was the last time you heard of someone solving a political problem by saying "hey guys, I've got a great idea here"?
Some not-absurd propositions:
1. "The finance system is shit"
2. "Modern government is shit"
3. "JS is shit"
All 3 of these have many potential non-shit replacements - but things never change. Why? Because barriers are very,
very real. These things could only ever fall to the most expertly executed, well resourced, and lucky of targeted attacks.
The only viable strategy for the average "hater" (whose "hate", incidentally, is emphatically not invalidated by his lack of perfect solution) is to try to affect top-down change. Now, no one person is likely to achieve this - even exceptional people have a fearsome challenge when faced with groupthink (Galileo, anyone?)
So what is in the "haters" toolbox? Well, seeing as web standards authorities are run like district councils in the 1980's (go try to find out how to make your view officially known on an ECMAScript draft), us in the peasantry have little but our ability to create and maintain a murmur - and occasional scream - of discontent which hopefully, one day, might have some psychological effect on those who do hold the power, because lord knows it's not us users. You may recognise this particular strategy from historical great hits such as "representative" "democracy" and friends where it has been, on the whole, a slow, inefficient, wasteful, but occasionally effective way of going about things.
So my well thought-out and actionable strategy is to ignore this advice and continue to grumble - and, if you can manage it, try to be just a little bit louder than last time: shit adds up at scale.
[0]: Mr Eich told me himself that they're too invested in JS, see https://news.ycombinator.com/item?id=9264531