After talking to Andrew this morning, I was in the middle of writing an esculation to the Map Maker team, as while Andrew found that one quote that seemed to say that Map Maker guidelines were going to follow this new process of closing everything and opening a new POI no matter how small the move; if you actually went to the logical place in the guidelines it still said just to move them.
However, as I was doing that, I see that Jade has actually annouced that Places has changed it's policy to follow Map Maker's guidelines. Places users are to now just change their address on their existing listing, as per how it has always been done in Map Maker.
Google Places Forum - Business moving locations? Here's what to do