A number of the members of the Chrome team. If you watch the announcement from when Blink hit, they did some developer talks. When asked about the integration of Dart into Chrome, it was fairly obvious that some of the guys didn't want Dart in there [0]. But at the same time, a high-level direction is being set to try and get Dart added.
Google employs a LOT of developers. A lot of those developers feel the same way members of HN does, that we don't need a language to replace javascript. Google is using their weight in the web world to try and get a new/alternative language added.
As long as Dart isn't completely shoved down our throats, I'm willing to give it a try. I think there is enough opposition within Google to make sure that Dart will at least have to live in peaceful co-existence with Javascript.
Google is pretty realistic that it'll be many more years before they can even have a chance of getting other browsers to add the DartVM. Heck, Chrome doesn't have it yet (outside of the Dartium build which has some fun memory leaks).