Sounds great, until they get bored with it and goes the way that many other googles projects, aka kills it off.
Between this and PNaCl it sounds like Google has two broadly similar irons in the fire. Buyer beware.
Stage one of Google's attempt to own the WWW.
Well actually their other attempt (HTML5 video) failed.
Now I f only they can be talked out of this "Dart" madness we can close the window on XSS attacks for good.
Looks like we will be needing nodart as well.
Will never fly
On the one hand
On the other hand. How long will google keep it going? I mean I trust google to keep a web based scripting language going far more than I do microsoft (hey psst hey how's silverlight doing? Oh... ASP? That got replaced by .NET you say? What about blah blah blah)
It started out simple many years ago, and gradually the world changed. We had to add a basic interface so language A had to have language B built on top for a simple text interface. Language B worked fine for a while but then started creeping into language As job, and the text interface wasn't modern any more, so we stripped back language B a little and put in language C for the interface, which still relied on calls by language B to language A. Now a few years on that interface was dated, so was replaced with language D, so we now have D calling C calling B calling A and various bits in between with design patterns layered atop design patterns. It's a mess. We can improve it and we are trying to do so every day.
At the same time however we're all agreed that it would be quicker, easier, and more efficient to scrap the entire code base and start over with just A and D since B and C are just doing As job badly.
All in all a good thing?
Cheeky sods. Pot. Kettle. Black.