It's impossible to predict the future, and what materials will be around. To me, the real danger is in the worrying about availability, and becoming hesitant to use what we've hoarded. It could lead to stagnation and paralysis. There are many photographers who we associate with specific materials/cameras/techniques. The good ones will adapt, and grow as image makers. The rest are one-trick ponies...
That being said, I miss many favorite films and papers. I wish we didn't have to discuss this stuff at all.
Or freeze all together in "Analysis Paralysis".
Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand