I think skjoldtc makes a good point regarding the trench guy. A trench guy that becomes management without leaving the trench behind is doomed to fail. Yes, you have to know the technology and best practices, but you have to trust your people with maintaining the level of skill the trenches require. If you can't make that break and focus on the higher level tasks set before you, it's going to be a tough road.

As was pointed out, good DBA's don't necessarily make good DBA managers and (arguably) vice-versa.