You say that like it is a bad thing. I don't think it is.
When it comes to making real progress you almost always need to buck the standards and drag the world kicking and screaming into a better future and then let the standards bodies figure out how to fit things in to their world later on. I'm continually shocked there are so many people in this industry that don't see this even though the proof for it is everywhere.
You mean the one where some large corporations are doing what they can to keep it from improving?
So in fact the "other players" _are_ directing their effort to something they perceive as better than Dart: Harmony.
As for the rest, what will "win" is not necessarily going to be based on the merits of the technology but on the strength of single-vendor tie-ins, in the usual way....
Regardless of who the actors are that are most currently gumming up the works, all of this just proves the point that standard bodies are not an effective tool for actually creating useful technology.
As you note, getting the innovation into a standard is the hard part, when some of the parties to the standards process don't actually want the language to improve...