Film isint going anywhere so why are any of you worried. this forum alone most likely buys enough black and white film in common sizes (135,120,4x5) to keep a small company like efke or foma in production.
Worst case scenario, last company standing (ilford, efke,foma) now has to produce for the entire world and has little issues, and all of those companies make a full line up of products and could no doubt expand that line if needed.