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The page views and time on site information will be of limited benefit since most of the pages involved wont be viewable to Google since they are behind a login filter. While many people believe that Google considers the factors you mention in their algorithms, I am not aware of any solid evidence or statements from Google confirming this information. In fact, Matt Cutts has specifically stated that no Google Analytics data is used in rankings at all. http://www.youtube.com/watch?v=CgBw9tbAQhU It makes perfect sense to me the factors you mention can be considered as part of the ranking process. I am sure many other SEOs believe they are as well. I would love to see any evidence to this effect. I think most people make this assumption. With the above understood, if you felt the move was a low level of effort, I would probably go ahead with the change. It sounds like it can be a bit nicer for employees to stay on the same site. If this was considered a big project, I would not make the move without solid evidence you will achieve the benefits you desire.