Well, I do think it is pretty much out of the question. We've been working on our Javascript based engine for about a year now, and still have plenty to do, so there's no way we can make time for this. It could come with its own batch of unforeseen limitations and problems as well. I doubt any one technology is a silver bullet which will solve everything.
Also, I am still 100% certain HTML5 + Javascript will ultimately match native performance and features. In fact, by the time we finished a port to Haxe, it may have become the case, rendering the whole project a waste of time.
We're working closely with appMobi and Ludei to make sure directCanvas and CocoonJS are high-performance platforms that cover as many C2 features as possible, and Awesomium should ultimately be as good as Chrome on Windows, Mac and Linux. If you have any specific issues, please be sure to report them and we can work on getting them fixed!