If their aim was to permit building desktoplike applications, they already failed, because the difficulty in building those has almost nothing to do with javascript. The big problem is the DOM api, which is too lowlevel to program large apps in. Javascript's limitations are almost inconsequential next to the deficiency of the DOM api.

Google invents too many programming languages, and too few frameworks / platforms. It's a typical computer scientist response to a software engineering problem. We don't need more languages, we need better api's.