I thought I was taking an optimistic view? Software is a tool like fire or the wheel. Barring a "Doomsday" (which I don't envision), our descendants won't give it up, even if they use vats of bacteria or lattices of anti-quarks or something even less recognizable as "hardware". One can imagine them giving up humanity and civilization. Eventually, both of those will seem pointless to anyone who isn't an antiquarian weirdo.