If browser makers offered to put it in the browser if the name is freed, I bet they could be convinced. The main problem right now, is that there isn't a major push to add TS to the browser.

The way I'm proposing it, technically it would be to make JS and TS kind of the same thing, but not fully, as someone else mentioned the goal of TS is still to tell the user (developer) about issues before the code runs. However, if done right TS files still get interpreted like normal JS, and technically you would want to compile them and not put them in the browser "raw" but you could still call it TS.