Is jazz experiencing an underground revival?

I am continually surprised how many people I know who secretly love jazz but don't have much to listen to. I was working in my office and was alone so I turned on some Count Bassie on my phone and started humming away when the next thing I know one of my co-workers is singing along with the track. It was awesome. I introduced her and a couple of others to Postmodern Jukebox and they were ecstatic. Is it just my office or is the popularity of PMJ and a few other jazz groups I have found recently pointing to a bit of an underground revival in jazz popularity - or at least taking the continued popularity of jazz out of the closet? Thoughts?