Honestly how is javascript (and thus typescript) ever going away at this point? I honestly mean _ever_. Like until the day I die. Almost the entire web is using it. Frameworks like React, Angular, Vue have made it so I basically don't care that much about javascript. Most of my code is server-side and the client is largely handled by Angular as a framework so the amount of JS I have to write in my angular components is so minimal.
All that being said, I personally am not a fan of javascript.. at all. The learning curve to know what's going on is horrific in my opinion, and code is not meant to be written clearly but have a small footprint which is terrible. It's too flexible.. though typescript has solved 90% of that.
Even if something like Blazor completely transforms the web, it seems like there will ALWAYS be the case for streamlined simple sites that only need very simple javascript transformations..
Anyway- unfortunately I think javascript is here for the next billion years!