Good point, I'd move Oakland before I'd move Colorado. If contraction were on the table, I'd contract the Marlins, relocate the Rays, and contract someone like Oakland... then reconfigure into two divisions of 14, eliminating the interleague every day problem (which isn't actually a problem).
Of course, more realistically, I'd like to see the Astros moved to the AL West, two leagues of 15, interleague play every day (I love interleague play, don't see why others don't), and either get rid of the DH in the AL or keep it the way it is.