Allowing more than one result from a website per page and Google Instant is a signal that Google is trying to encourage the big websites, quality websites, brands. Step by step the content will become more important than ever, why ? to build a brand, a quality website, to make people search for your site you must have good content, build a "name", a "brand", exactly what SEO was supposed to be at the beginning (good position in SERPs = people are linking to you, because you are good).
I think Google is trying to eliminate the speculations from the search results (more searches for a site = something important,good site, brand). This could be a major ranking factor in the future not only a feature.
Will be harder and harder for search engines to control the SERPs, the quality of the results so I guess more filters will be introduced in the future.