I am certainly interested in the command track, that is one reason I switched my primary to Science so that I can get a better strategic view than available in Engineering. Having the opportunity to XO while a regular XO, or captain, was off commanding cadets would be interesting. That is actually a benefit. If a captain commands the extra vessel, his XO has a shot at command experience.
Personally I think it is far too soon to expect to establish a sixth permanent captain and XO.
Speaking of availability, Mundy and Matsiyan will be away on Stardates 51116-2237 and 121116-2237. That should be the last absence for quite a while though.