The two models that are being continued are at the top and bottom of their 35mm range, the F6 and the FE10, which presumably means that they see professionals and students as the only remaining market, with serious amateurs buying digital. The FE10 is made by Cosina, so there is no risk to Nikon by continuing it, and as far as the F6 goes, that's fine but I don't expect to see an F7.
Film isn't going to disappear, but it will become a niche market. New 35mm cameras are being launched, just not by the big manufacturers. For example, the Zeiss Ikon rangefinder (also built by Cosina) came out recently, and from teaser advertising on the Zeiss website, it looks like they are about to announce a range of manual lenses with a Nikon fitting. That would make sense given Nikon's recent announcement. On the secondhand market there is a brisk trade in quality equipment, and I've missed out on a couple of auctions recently for enlargers, where there seems to be no shortage of buyers.
One day they will have to pull my FM2n from my cold dead fingers, and I don't think I'm being too optimistic when I say that I expect to still be able to buy 35mm film right up to when that happens. Maybe not colour negative film, and probably not the huge range of B&W film I can get now (at least 25 or 30 different films from 10 or 12 manufacturers right now as a rough estimate), but a few films at least. If not, I'll have a freezer full of film and paper. If I had the money I'd buy a new FM3a while they are still available.