I've cut out morning nap completely for all my kids (on occasion my own 13 mth old will go down for one.) I feel the over 2 group don't need them as long as they are busy. The under 2 guys used to do it but it ruined their afternoon nap and it always seemed to conflict with morning plans. I don't even like them falling asleep while we are driving home in the morning (like 4 out of 5 did today) because it messes things up. As I type this I have two little guys who I can hear in the monitor laughing, whining and talking. They should have been fast asleep about an hour ago. But as mentioned this morning in another post, they are in there until 3pm. I need my break too!
If I find any of the kids are getting cranky in the morning, I will make sure they are not hunger first and then I'll put them in a quiet place and tell them to 'take a break, some time to themselves and cool down a bit." It seems to work the majority of the time.