When they reach their level limit, they can release 3 new classes (one for each stat point) with a complete new list of 12 skills for each and have players start from the very beginning all over again. Maybe introduce a skill tree for SL since all the characters are human and allow players to customize the exact player the want to fit their playstyle. As long as the funds keep rolling in to pay the staff and the server costs, I don't think PL/SL are going anywhere anytime soon but your thread does get the creative juices flowing.