Past 10 years I saw many statements that "technology X will be soon dead". Most of those Xs are still alive and in good shapes.
JS is the common compilation target of the web, and also happens to be a language that many programmers find tolerable enough to use directly.
As nice as it is to have multiple options of source languages for the web, there's a lot less value in having multiple options for compilation targets, as well as greater costs (particularly given how tied execution engines are to browser engines, so that you really need a separate engine for each compilation target for each browser engine. Having a reliable, good-enough cross-browser target language that is a the intersection of the JS supported by each browser engine is easier than doing that same thing for multiple different target languages.
A new target language is going to have to offer really compelling improvements in execution to make sense to compete with JS in that role on the web.