as of now, it should be as there is nothing other to do at level 30 anyways... they chose their level-up way in form of gear (which basicly means that you could go back to 20 anytime by picking bad stuff)... if they get a higher level-cap with new dlc (or even more than 1 planet with different level-zones basicly) then you get your levels through that DLC, maybe specific pvp/pve for stuff from that DLC (which would also intruduce a new exotic set i'd imagine... or a new rarity all in itself, though that would make it impossible to achieve without a ton of luck.. so yeah, wouldn't quite work)