I think it's a solid system and just needs a little time to catch on - slow burn like you said. It sucks getting in to it at this point because I feel like I kind of have to fan the flames a bit, which is something I have no interest in doing. But I want it to grow so I have people to play with! And again, it is a really good game. The second edition just came out so it will take some time. I am going to keep playing it so there will always be at least one player, but I think a few more people will realize it's a really good game.
I think the danger for old warhammer folks is comparing it to warhammer. Some of the things we got used to, random charges for example, or removing models from units, are gone. I think I prefer KoW in a lot of ways, but most importantly in the way of balance. Nothing is perfect but at least the Mantic guys put effort in to it. GW never seemed to care about giving us a balanced game.