I think they should quit while they still have some kind of dignity. Imo, Infinity ward had the best layout for campaign and online gameplay with cod4 and mw2. It's true that treyarch brought zombies to the table, which I'm not gonna lie was my favorite part of world at war, but I feel like once they made the first black ops it was all downhill. They managed to redeem themselves for mw3, but only briefly before plummeting into darkness. They had a good run, and as many have already stated, they laid out a great base for fps games, but I feel it's time for them to step back and watch what they (as well as others) set into motion.