Like being an NFL head coach, Chairman of the RNC is a prominent and prestigious position -- but it is also a working job with a long list of attributes that are rarely found in combination: know the game; be able to manage a large group of people, many with big egos; raise funds; put together a capable management team for the RNC office and field operations; get along with the team owner (Trump); work the news media; and recruit good candidates and force bad ones (Nikki Haley) out.
All said, a successful state GOP chairman is usually the best choice for RNC chairman. That leaves out Scott Pressler and Harmeet Dhillon. with the additional problem that Pressler is too fruity. The report of the North Carolina GOP chairman as Trump's pick makes quite a bit of sense.