If people continue to purchase Tri-x and Plus-x in reasonable quantities, then I think Kodak will continue to provide them. Kodak built a new state-of-the-art coating plant for films a few years ago. The only thing Kodak has discontinued is their b/w photo papers. They have stated publically that they are continuing to manufacture film. I personally have not cared for Kodak b/w printing papers in many years, preferring ILford & Agfa. It is doubtful that Kodak would be willing to give up the manufacturing of film, as there is still a huge market in movie camera film for "Hollywood" type productions. Most cinematographers prefer film for capture, even when the program goes direct to TV. So if the budget allows it, the show is shot on film. About 98 percent of theatrical movies are still shot on film. About 98 percent of all movie theatres exhibit all their movies from 35mm film prints. Quite a few billion feet of 35mm film yearly.
Then there are the "specialty" formats such as IMAX which is totally dependent on film. There is no digital alternative.
I wonder where Ilfords color paper materials are manufactured. If, they are produced in Switzerland, then I would question whether they would continue to be available. It is the plant in England that went through administration and sale. This is a b/w only plant.