I agree with you 100%, appmobi (which to be fair is more oriented toward apps) and cocoonJS turned out to be a total let down.
Inconsistent updates, BASIC features (like Game Center Leaderboard/Achievement) are still not supported and more than anything there is no transparency about the business model.
The rise of Ejecta (and other Open Source wrappers that might rise) is making it even harder for Cocoon, they need to step up their game, they can't afford to be 2 months behind Ejecta like now, otherwise no one will buy their product.
Also is pretty clear that CocoonJS developers don't care about mantaining the plugin, look in contrast to Clay.io, the developer is always available and ready to answer and keep everything updated and in good working order.
Ejecta could be made more popular by C2, the issue is that Ejecta exists to back up another JS Game Engine (Impact) and the author originally made it to increase the sales of its own Engine, so a partnership with Scirra would be unfair to both parties.
This is the reason why I made my own exporter/plugin, hoping that more people will use it and in turn expand it.