I'm not sure if it's exploding, but I've converted around March. My last overseas trip to Nepal was shot only on film.
Now I'm working on converting one of my friends as well, at least for his black and white photography. He started looking at a used hasselblad 500, but he is still hesitant. Although he likes my results a lot.
I the popularity is growing, but people are a lot more aware of it and might consider it.
Although, humans are LAZY. Converting to film is the same as telling people to go to gym, start cooking at home, eat healthy and lose weight. It's just not going to happen...

I should also mention, that I've received quite lot more complements for the photos I've posted on facebook. Very often followed by what mobile I've used to take them with and which one do I recommend.
Once I answer that it was taken on old film camera, I get silence...