I want to give my 2c even though I'm only playing with the free version for now.
I have to agree with Ashley here as porting the engine to different platforms, even using so called meta languages like Haxe or Monkey, is a massive job that would take resources out from the editor, which is the real selling point of the product. Look at what happened to Stencyl, which has been in beta forever because of audio and memory leak problems in the engine itself and not in the editor!
Crosswalk is obviously getting there, at a speed of development that is probably a nightmare for Ludei. The Android part seems covered though it needs to sort out a few things.
The desktop part with node-web kit is well sorted out I think, so no point in talking about it
The real problem is iOS. Even if Apple rolls out a version of Safari with webGL in the near future, it would hinder competing products like is doing with the current implementation of Chrome, where they can't use hardware acceleration. This could pose a problem where there might never be a version of Crosswalk for iOS, which is a real shame considering the mobile market and opportunities.
Ashley: I think the solution in this case might be simpler than you think. Why don't you make Ejecta, which is an open source project (and working really well), an official part of C2 by creating an exporter for it? The amount of resource to make this work shouldn't be too big as there are people already using it, and Ejecta is a fairly complete solution with iAds and Gamecenter already working.
I know you don't like that kind of technology, but by supporting it (at least until there's a Crosswalk solution), people are going to be able to have a decent solution for iOS too, without having to do fancy hacks to make it work (you could generate the entire project on export, and then people with mac would have to just compile on xcode).
Think about it. I'm pretty sure a lot of folks would stop complaining and asking for a giant rewrite of C2 which I think is a crazy request!