Why Not play Damon at first?

The Yankees are getting little production from first lately and with Giambi hitting well they have no spot for Damon in the OF or DH. So why not go back to the Damon at first base experiment? Next year they don't have any other room for him anyway. According to this post at RLYW Damon at first is the best lineup the Yankees can put out their so why not do it?