Who cares who the Secretary of State is?
If the SOS does anything, it is to carry out the foreign policy of the President and take the arrows for the President when something goes wrong. I really believe that Obama picked Hillary to get rid of her. Most of the time she was as far away from Washington as possible: e.g. Uruguay, Burma, etc. When Bin Laden was killed it was Obama in charge. When the Arab Spring collapsed or the Ambassador in Libya needed military support, Hillary was in charge.
I'm no Mittens fan, but if Trump thinks that he will work best for him, that's good enough for me. I've had a favorable opinion about Trump for a lot longer than this election cycle. I suppose that opinion could change, but for now I trust his judgement.
I think Trump will do what Nixon, did run his foreign policy trough the National Security Advisor. The SOS is reduced to be a COO, an administrator of the department & said policy.