Upload & Sell: On
There may be fewer places to buy film, but you can easily still buy it, particularly online.
Comparing film usage to war re-enactments is just as nonsensical as the earlier bit of it. I think there are more film shooters than you think, including those who (like myself) shoot a lot of it. It's not a hobby for me. When I use film, it's almost always for something that matters to my work;.
There are also considerably more fine art photographers than you seem to think.
There's still some B&W out there, but even so, many "old faithful" types are gone from the biggest producers. Kodak ceasing says it all for me -- it's becoming a much smaller fishpond. Color film is getting sliced and diced -- even my old fave Fuji is limited in its offerings, and I live on color, not B&W. Since the 70s, B&W is a niche, and now a niche within a niche.
I do know something about the art world and galleries, being half a painter in my life. Of the galleries out there showing artists work, painters are by far the dominant majority. Very few are devoted to or feature photographers, and generally speaking, prices for photos of similar size are far, far below paintings -- and for good reason -- far less effort, skill and materials goes into a photo than a hand crafted original piece of art.
We can argue the inequities of the values of art, artists, and mediums, but there is no doubt fine art photographers are one of the least represented and lowest paid (in general) genres in the art world.