It depends on the area and group you play with. For my group, it's stayed around, but it was really strong "everyone plays WM now" and then it died off and Warhammer came back to the fore. I've seen it come in and promptly die in other groups, and there are some groups in my area which started WM and have never looked back since. It's a fun game, but not really my thing. I prefer Fantasy over WMH for the same reason that I prefer Fantasy over 40k.