Well, I have long held that a perfect search engine would take
seo out of the picture to some (large) extent.
If you could find precisely what you were looking for every time, what role would
seo play in th eperfect search engine?
SEO would only skew the perfect results and as such would have to be ignored by the perfect search engine.
... of course there is no perfect search engine but even if there were, I could easily see where advertising in serps with paid placement might not only survive but flourish. If that were your only shot at showing up for something slightly more or different from what is specifically included on your page it would be highly desireable I think.