Even if you had that environment today, how would you replace the function of JS?
Web development moves faster than any software in history. A lot of this is on the back of JS being ergonomic/fast to code and having very good performance and a lot of what makes it good at this is also what coders familiar with other languages dislike.
What other language has that right combination of really fast development and good performance?
You would probably have to go outside the mainstream to something like Scheme or StandardML to get the ergonomics and performance, but that would upset a whole other group of people.
After that is an even bigger problem. If everyone adopts different languages, different frameworks for those languages, and different user-facing APIs for the WASM APIs, then finding devs for your frontend team who can be productive quickly suddenly becomes impossibly hard.
Web development moves faster than any software in history. A lot of this is on the back of JS being ergonomic/fast to code and having very good performance and a lot of what makes it good at this is also what coders familiar with other languages dislike.
What other language has that right combination of really fast development and good performance?
You would probably have to go outside the mainstream to something like Scheme or StandardML to get the ergonomics and performance, but that would upset a whole other group of people.
After that is an even bigger problem. If everyone adopts different languages, different frameworks for those languages, and different user-facing APIs for the WASM APIs, then finding devs for your frontend team who can be productive quickly suddenly becomes impossibly hard.