SEO will die. Or be mostly replaced by computers. I think it farming is a good example. Industrial revolution made things easier...replaced people (hint hint) and then technology added to that replacement.
I think too many people in the SEO sphere think technology won't replace them, it will, faster than I might even project (30-60 years).
SEO is mainly thinking about of text and links but what about technology that can get into the MIND of the users and discern that. I'm not talking browserrank (MSN's), I'm talking nano-technology. It's on the rise and with free Wifi world wide....we'd all be on one network, that's a lot of data to play around with.
I don't think when my future kids become adults, they will even know what an SEO is. If they do, they will be few and far inbetween just like farmers.
I don't think technology is something to fear but to embrace because it free's up time to allow human-kind become more productive to betterment.