Just my opinion, based on what I've seen...

Overall, no, I don't believe revolvers are becoming more popular. I do think their popularity has been increasing in certain niche markets, such as the non-LE concealed carry market or those into "retro" models (Kimber is an example of the former, Colt is an example of the latter). I don't have an interest in big-boom, magnum and mega-magnum guns, so there may be some increased popularity in those markets; I can't say with any certainty. But in the larger, overall market, semi-autos still dominate.

FYI, a similar thread was active not too long ago. I'll say basically the same thing here that I said in that thread: Asking about the popularity of revolvers, in a forum dedicated to revolvers, is likely going to result in responses biased in favor of the revolver.