Back in the day I loved altavista. You could submit a bunch of sites that were nothing but a few small pics and a ton of keywords and rank in the top 10 within a few days. It never lasted, but you just kept kicking out sites.
Google will always need human influence simply because they want to deliver a good product to their users. That product is quality serps. If they go to some kind of auto algorithm that doesn't take the SEO of a site into perspective it could hurt their serps. When people stop finding what they need or want they will go somewhere else. There have always been people who figure out the auto algorithms so when the secret gets out the spamming begins and the serps suffer. Users are fickle and will quickly leave for other sites.
I would imagine how they rank will continue to evolve. They have been saying that quality sites will rank higher than lower quality sites regardless of inbound links for a while. It is starting to happen. I just had site hit #1 for its keyword. I had been at #2 for about 3 months and in the top 5 for about 6 months and just hit #1 a few days ago and of all the top 5 sites I have the fewest inbound links. but I have good content and a very user friendly site.
I would imagine this trend will continue. Google didn't get to be #1 by not understanding what their users want and figuring out the best way to give them that. The internet is an interactive medium so they need us just as much as we need them.
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