Will there be, one day, something that helps you export your game on mobile devices easily ?
Technically impossible (unless the way of the mobile OS really changes).
You'll always need a step in between , because the second part needs to make the packages work on too many different devices with big differences between them. And that conversion (no matter if done by crosswalk or the intel method or something else) needs such a specific knowledge that the people programming that simply don't have the time to learn how to program something else.
Having a direct export (without the steps between) would require the MV-programmers to learn all the specifics of all the mobile devices, which would require them to spend another year learning that as well as probably tripling the programming cost for whatever RM that would do this - when there is absolutely no need for that because others put in the work for those conversion programs.
And that doesn't even consider the problem that you can't get all the info due to licencing restrictions Apple places on the iOS-conversion: you have to use the Apple-Program for conversion to iOS and application to the applestore, because those details on what is done there are not puiblished.
It might be that the conversion steps will be more automated by time, but that is something outside of RM and cannot be changed or handled by the RM programmers in any way.