Hardly any commercial photography is done in film, except some wedding photography. And even most wedding photography is done digitally, except for some medium format. Generally, if you're doing it commercially, you want to limit your costs to maximize your profit. Most clients these days don't care much for film, and if they do, they'd rather have the "film look" applied in post than pay for actual film to be used. The only reason that some wedding photography is still done in film is because some people prefer their wedding photography to look like their parents and grandparents photos, which were all done in film. So it's a continuity and nostalgia thing for them.
Most hobbyist photographers either use digital or 35mm film, with some medium format out there. Large format photography is still pretty rare, with fine art and more serious hobbyists being the majority of users.
For me, finding large format film and finding places to develop it locally is impossible. None of the local places that still sell and develop film will process sheet film. However, thanks to the internet, finding a place to buy sheet and process sheet film is really easy. There are a ton of places online where you can buy those products and services.
I imagine the majority of people who shoot 8x10 film either scan it or contact print it. 8x10 enlargers are pretty rare, bulky, and expensive. However, 4x5 enlargers aren't too difficult to find, so a lot of 4x5 shooters will print their own. Decades ago it was quite a hassle to set up your own darkroom. These days, you can easily purchase everything you need used at a very reasonable price, and find all of the information you need online to figure out how to do it all at home. All you need is a room you can make dark. It doesn't even need to be a permanent room.
The beauty of large format these days is the gear is so cheap. I can buy a really nice 4x5 setup for about the same price as a nice 35mm or medium format setup. A Sinar F2 is about the same price as a Nikon F2 or Pentax 645. Even lenses are fairly cheap, with many high quality lenses in good shape being sold for under $300. The price of enlargers are all over the map, with some people finding 4x5 enlargers in good condition for free, and others paying several hundred for 35mm enlargers. Their prices seem to be more dictated by your local market, as they're hard to ship. About the only difference in price between 4x5 and 35mm is the cost of film, which is still pretty significant. 8x10 is also relatively cheap compared to what it once was, but 8x10 enlargers can be costly and difficult to find, as well as 8x10 cameras and lenses. Still, 8x10 film and developing isn't too hard to find if you look online.
What's kind of disappeared is 5x7. The cameras and lenses are still out there, but the selection of available 5x7 film is getting harder to find. It's not quite to 220 or 70mm levels, but they're definitely not as common as 35mm, 120, 4x5, or 8x10.
