Yes! absolutely! I think about these situations all the time and love discussing with people.

I agree that the Wall-E situation is much more plausible as well and I think that it will stem from humanity's need to constantly entertain itself. Relying more and more on tech to get more and more entertainment, on demand.

Check out a tv show called 'Caprica.' Its from the Battlestar Galactica universe and (among much else) shows the end game of virtual reality. People completely disengage from the real world whenever possible to live their virtual, much more entertaining life.

Oh, coincidentally... the place where I work already has a system called Skynet. Its always a good opportunity for a Terminator joke whenever we need to reference it :)

No fate but what we make. Ha!