Keith is very right.
The best we can hope for at this point is that Fuji would be willing (say in cooperation with Unsaleable) to make special runs of 'heirloom' emulsions: 669-like, 55, Choco, Sepia, etc. In that instance they would have a guaranteed buyer for the entire run. However, I notice that Unsaleable still has stock on the run of 2000 Choco-80 twin-packs. They were manufactured at least 18 months ago. That tells me the art market for instant film is much smaller than Polaroid fans are willing to admit.
As for integral film that is SX-70, 600 or Spectra compatible...the odds are looking pretty grim. Pickup a Fuji Instax camera and get practicing.