Uhhh...lots of Microsoft employees working on Typescript is a good thing. Pulling the old, "We're happy to leave this in "the community's" hands would be a bad thing for obvious reasons.
You're right, no open source projects that weren't developed in the majority by a single large corporate benefactor have ever succeeded. We can trust those corporations: they have our best interests at heart. Now if you'll excuse me, I need to get back to my successful career building applications for the Google Glass.