MCO and a couple other airports aside, this is what I usually see:
- disabilities: 2-4 people (frequently one or none)
- active military in uniform: none
- GS: 2 or 3 (frequently one or none)
- Group 1: 20-40
I'm in favor of this reversion to the mean (and I don't have an infant). Enforce the rule: infants only, no 3+ year olds. If they can walk and talk, they board with their seating group. There will rarely be more than 2 families with an infant, and anyone who has traveled with an infant knows how hard it is; give these folks a break.
IMO United's boarding problem is that Group 1 is simply too big, and this change won't solve that problem but it won't make it worse, either. Board GS and First Class at the same time, take FC out of Group 1...that will shrink "Group 1" down to frequent flyers stuck in the back without devaluing it for anyone up front.