RoboVM is very promising. I bookmarked it some time ago, but unfortunately i don't see any progress since then. For example there are still no any documentation.
Yes, they should push the platform not the language. There is still a very big potential in java. I am thinking about something like java se on ios. Or a new mobile platform based on java se. Or even better: a platform with html user interface and everything other java se. Firefox made it on javascript.