Now that we have uncapped conquest hopefully one day uncapped honor I think it would be a good time to introduce a Conquest box for alts for this season as its already at the point where most people are geared enough to want to play alts but grinding is pretty punishing of a timesink for almost no rewards. I think that after a certain time blizzard should really decide it is a good time to uncap things and let people branch out by offering alt tradeable items
I would also hope we could expand the heirloom system for PvP gear to include two kinds of trinkets which give a bonus for people not max level to kind of even the playing field a little more as well as a PvP gear set bonus for the people who really like leveling in Battlegrounds which could reward like full health for capping a flag in WSG or having ur vehicle destroyed in Wintergrasp could grant you damage immune for 2 seconds or Killing guards in AV could give a 2% move speed buff stacking or something just to spice it up a bit.