Look no further than our own back yard. Delta is pulling the same move, decreasing leg room on the CRJ/ERJ to make space for Economy Comfort.
10/20/2011 Press Release:

The new seats will feature pitch of at least 34 inches or more. Delta's standard Economy Class seat pitch is currently 31 inches. In addition to more leg room, customers seated in Economy Comfort will enjoy Priority Boarding.
The product will be installed in the first three-to-five rows of the Economy cabin by removing a negligible number of seats from the current cabin configuration on all of Delta's domestic Boeing 767, 757, 737, MD88, MD90, DC9, Airbus A320 and A319 aircraft, and all two-class regional jets including the CRJ900, CRJ700, E170 and E175 aircraft types by summer 2012.

Delta Expands Popular 'Economy Comfort' Brand - Oct 20, 2011