I don't see it as a problem once the novelty of WoW wears off for your players. I have played an MMORPG ever since the beta of EQ1 and it's never been a problem (through EQ, UO, DAoC, CoH, Eve, EaB, CoV, EQ2, and WoW). I play when I feel like, which is usually every night, but if there's a...