The lesson is to use what suits you, and if something is discontinued, you find something else that works. You adapt. The most critical aspect is, after all, to make beautiful photographs, and truth be told, what film you use is probably not going to matter that much, as long as you're willing to learn how to use it. I do understand the infrared film conundrum, though. That's a pickle, for sure, but as always supply is intrinsically linked to demand, and if we don't buy enough of it, the supply will diminish. Accept it and move on. There is very little else that can be done. Do it for the arts! Do it for photography. Stay positive and make good art.