There is a 70 year old Super Ikonta here that can still make a pretty good frame or two. I suspect it'll be here for at least 30 more years.
Early M series Leicas will get my vote as will my old Pentax Spotmatic.
But, you know, in the scheme of things 30 years isn't really all that long. Why not ask what will be here in say....130 years. I'll bet some Leicas and
old Spotmatics will still be around. Will film?