Gates seems like a reasonable choice to replace Rumsfeld, imo. coming from that Bush 41 circle who thought taking Bagdhad was a bad idea the first time around, he's not likely to be keen on the idea of prolonging the occupation.
almost of equal importance, he has argued for direct talks with Iran - something Bush 43 has refused to do. it's a good time to replace belligerence with pragmatism in our foreign policy - Gates seems to be a good candidate to do that.
and speaking of belligerence, this should also be the end of John Bolton's chances to become permanent UN ambasador.