"Flipping the sod" for Google - Dumb idea?

OK, I'm just making this crap up for theoretical purposes - lets see what's dumb about it.

Let's say I've got a Wordpress blog where I've posted (1) page of unique, quality content every day for 6 months. (The site now has 180 pages of really good stuff.) I haven't been syndicating the content, nor has anyone copied it. (Let's just say) I now want to move onto something else, I'm done.

Why couldn't I delete the first post/page I did 6 months ago, let Google de-index it, then repost that onto my index page again as fresh, unique content? I then keep deleting the older stuff in order, then post it shortly after that as a new entry. I now loop this procedure continually.

** Does Google keep track of pages that are now gone? **

Is it more important to have an older, static site that never gets updated - or have a site that is constantly being updated with something good?

[note: I know the correct answer is to have an older site that keeps getting updated, but let's say I'm now juggling dozens of sites and I've hit the wall.]

[note note: yes, I know the correct answer is to OUTSOURCE new content, but let's just say for theoretical purposes..]

I think you would be making a huge mistake. I don't know how long Google keeps track of older content, but it is definitely longer than six months. You new site would probably never get indexed, and your old site would lose out also. Bad idea in my opinion. Why not just sell it to somebody who is interested in developing it further?

I figured this was all a bad idea, this is just all just theoretical. Does anyone know for sure how long Google remembers old web pages? And how do we know this?

You didn't way why you were thinking of this?

Presumably to get a SERPS boost for fresh content?

Personally I think people over hype the whole dupliate content issue with Google. I've never seen real evidence that duplicate content does much harm. As for re-posting data that was posted previously and deleted, why would they care? They'd just re-index it.

In any case it's quite valid to update a blog post and re-ping, happens all the time just to correct a spelling mistake, add a note.. if you like just change a word or two to a synonim.... You don't need to delete the old post.

As you remove 1 page each day and repost it on your new site goto your old site, setup a 301 redirect from the old page to the new one. Should avoid any penalties at that point.

Infact it's not really neccessary to even delete the old post if you just 301.

i don't know how long google keeps pages. but there is a feature called google cache that can show you older pages that are not deindexed. i don't know about time frame.