Why not handle this the way
MA handles everything else?
All skills are transferable but at a HUGE ped cost? Now knowing
MA, it wouldn't be a straight forward thing either, no, can't do that can we?

They'd most likely make a NEW type of ESI made JUST for transfering worlds, so that you have to chip out skills from this one and then send it to your avvie in the other world, and then reskill in this one.
So in true
MA style, it on the surface appears free/cheap, and seems to cater well to the players and in the meantime has all kinds of levels of ped taxing in the process to ensure that every bit of skill crossing means mucho peds in
MA's pocket.
That is my prediction.
That being said, what would I LIKE to see?? I'd like to see that your avvie could just physically visit the other worlds, all normal like, that the pilots get to fly you there, and that the onus is on the new worlds to provide NEW content that requires NEW skills so there remains the incentive to skill on the new planets.
But..... what I'd like to see even more?? I'd like to see them finish this planet!!! Hadesheim anyone?
-Remmie