What I find funny is that this is, ironically, Microsoft's old strategy but with a positive twist. Embrace, extend, extinguish. Microsoft has already embraced Javascript - we could argue that they brought their own demise as the dominating platform when they created XMLHttpRequest. Now they're extending it.

Maybe I'm naive but at this point I don't fear Typescript extinguishing Javascript. If they send things to ECMA for standardization, they'll definitely prove a point in this direction.