I don't buy any film (although I do get the occasional NFR samples from Kodak).
As far as I'm concerned, film will always be available. (Unless we get hit with a supernova somewhere that puts out enough of a blast of cosmic rays to ruin the lifetime supply in my freezer, in which case I think we'll all have other things to worry about.)
No, I'm not personally worried the availability of film. (Now ask me about the availability of processing. I can, if worse comes to worst, make C41 and E6 from scratch, but as far as K14 goes, it's now IMO a race to the bottom -- to see if I can get to the bottom of my stack of Kodachrome before Dwayne's sends out a "That's all, folks!" notice.)