I love Malifaux, but that's a bit of a stretch. There have been a ton of solid skirmish games since C3 including Infinity and HellDorado. Malifaux is one of them. And as many fans as there are for the game, we have an equal amount locally with a distaste for Malifaux. And yes, they've bought and played it.
I don't think there's any sudden shift in popularity of skirmish sized games as they've been around for years. Warmachine started out skirmish size before it evolved into what it is today. Confrontation was around in '98 or '99.
I think the only difference is the new "generation" of gamers that started with Warhammer or Warmachine or Magic or what have you is noticing other things. It was the same for those of us like Weird Sketch and I who started with Fantasy in 2nd or 3rd, and 40K back in Rogue Trader or 2nd edition days. The difference is we had some smaller skirmish games within GW, that when they dropped the games, we looked elsewhere.
I can get a game of 40K or Fantasy at the drop of a hat, so the popularity isn't ebbing there. Any of the skirmish games, I have to schedule games with only a handful of opponents to choose from. At it's height, I had 10-20 players showing up for Confrontation, so skirmish isn't new, and I don't think related to an economic shifts.
Skirmish games are definately becoming more prevalent on the market though. I think that has more to do with the aging gamers. When I was in my teens and 20's I could play anytime, anywhere, get models painted and still go to the bar and do that stuff. Now that I am in my mid 30's, I have less free time due to career, and other committments. And my (girlfriend (wife) and I don't even have kids. I've seen lots of friend's gaming die by the wayside, only to get more games in once the kids hit a certain age. Then they only have time for a skirmish sized game rather than a full 3 hours for a game of Fantasy.