"Why should I Stick With WoW after D4 Releases?"

We’ll have to see if D4 end game works better than WoW’s. It is hard to say if the game is even long term playable from the beta leveling areas. Is it going to be balanced like D3 where you play 4 hours a quarter to get your stash tab and pet? Who knows! Maybe not even Blizzard knows yet.