It seems to be catching on very well. Depending on which class ship you're doing, there are lots of tables for two available. The Conquest Class ships have the second level of the mid ship dining room set aside for "your time dining", and there are always lots of folks there I've noticed, and many at the small tables next to the railing, overlooking the lower level.
Have a GREAT cruise.
Marine, Pilot, Singer, Tuba Player, Carnival "Diamond"!