What exactly you mean by leaving your site on autopilot? You are not talking about scrapping content from other sites and creating loads of pages on autopilot, are you? If that is the case Panda 2.2 is just going to vanish your site.
no, its not scrapping content from other sites.. my site is on autopilot, no work or content is involved
Did people actually upload those, I don't know plan/flat pictures? Or you collected those? Looks kinda crazy lolz.
after Panda update Google takes care much more about auto pilot sites which harvest duplicate content from other sites
i such cases you will definitely have an issue of duplicate content. But yet again if you can create a website that can draw numerous visitors then all you will not have to worry about SERP. So try to make it as informative and as attractive as you can.
You will require regular promotion to keep it up on the SERPs, if you stop building links then it is possible you'll lose the SERPs.
of course it will if your talking on unique content on page seo and of course it will for backlinks for off page seo. Seo and backlinks is a never ending process.