Yes, film sales are growing. Perhaps not among seasoned photographers. i.e., those of us that “did” film for decades because that was simply the way photography worked. There is a whole new generation of “new” film shooters. I know many of them, as there is an active and growing community in my area. The Ilford dealer in Dallas has reported sales increases each year for several years now.
However, while film sales numbers are up, new darkrooms may not be. It’s a paradox. This community of newer film shooters I know of are generally not printers (in either medium). They scan, if anything. And even if they scan their negatives, few are printed. They get shown electronically, same as most digital images.
I teach darkroom at Dallas Center for Photography. We have a hard time filling up the classes, in spite of the “interest” always expressed online when classes are mentioned, very few people will offer up the money to actually pay for instruction. (It's those Youtube videos ...)
I’m not saying I don’t get it entirely. And I understand as well as anyone that having a darkroom is a matter more of real estate than equipment or skill. In the film-only days, one would be much more likely to dedicate space to a darkroom because there was little choice other than sending work out to be printed by a lab. Now, fewer will make that investment in space.