I guess it all depends on what happens with film, first and foremost.
Whatever film format is the last standing, somebody will make cameras for.
Digital is, of course, not 35mm. However, I do call full frame digital cameras small format (unless, of course, it is medium or large format digital). I call small-sensor digital cameras (like 10D, D70, etc.) subminiature format, as their sensor is pretty much like a piece of 110 film or smaller. It is pretty silly to me that the digital subminiature cameras are about the same size as the small format digitals. IMHO, the best submini digitals are the Rebel/D40 types and the high-end point and shoots like the S95 and G series, because they are small. When I go to upgrade from my 10D, I may just get a Rebel or a Nikon D40 type camera.