When I was into photography in the 90s I had to look at ads in the back of magazines or in Shutterbug and pick up the phone, during business hours, to order my supplies. When I got back into it circa 2010 I was able to order anything I want, any time I want, even at 3 AM, with a few mouse clicks. I've ALWAYS had to order. Back then I lived in a small town with only consumer C41 available OTC, no chemicals, no paper, no black and white ANYTHING. I could drive 20-30 miles and get black and white film, SOME paper, and SOME chemicals, mostly the most popular Kodak stuff, if I could go during business hours and wanted to pay a lot more, so I ordered then. I order now. The only black and white item I use that's been discontinued was TMZ and I like D3200 as well, better in the sense I can get it in 120. Efke is gone but that was only infrared for me and I stocked my freezer with IR820.
Now color is a bit different in the sense that we are losing E6 films, and one after another my favorites - Astia, E100G, and Provia 400X, all gone. But in negative film when I came back to photography I immediately settled on Portra 400 and Ektar 100 and I can still get all of those I want too.
What problem? There simply isn't one unless you insist on walking to the neighborhood brick and mortar to buy which I have NEVER been able to do for paper and chemicals, and only some film, even in the 70s where I lived at the time and was getting started.