But... we are leveling in PvP - our PvP-rank just needs to become meaningful again.

I dont really think we need another option for PvE-leveling - and I dont think that that option should be PvP.
I'm not only worried to have people who dont know PvE later because they leveled in PvP but also the opposite: Have people in PvP who dont know how to play their class because they've never really played it before.