M.O.
J.,
I certainly can't compete with 26 years of experience! But I would definitely say that this is one of those "phases" - I'd watch him. Some kids "grow out" of needed naps. That doesn't mean that overnight they don't need them anymore, but moreso that it becomes to difficult/too much of a fight to get them down for one than it's worth. What about "quiet time" instead of a nap? Can he watch a movie? "Play" in his room? If you change what you call it and change him being put in his crib, and instead allow him to play with a few toys with a radio on, I know I've had success with this. I even made a "bed" for all the dollies on the floor and space to 'read'. Either the child falls asleep on the floor-bed or recharges their battery enough to be tolerable for the rest of the day. Just be advised if you do this, you may need to push bedtime up 1/2 or so.
Good luck!