I agree with those posts predicting that the supply problem is going to be more with film than film cameras. I'm confident my Nikon F, and possibly my FM2n's will outlast me. However, film supply could be more uncertain. Already Kodak appear to have discontinued tranny film, with the result that Fuji have hiked their prices, already Velvia/Provia here in the UK, is priced at £9 per 35mm cassette, and that's without processing charges!.......Thankfully Agfa Precisa 100 asa has been relaunched at a price that used to be paid for Provia. Hopefully they'll continue to manufacture it at a reasonable price.
Rising prices of film and processing materials are the main threat to the future of film photography in my opinion.