Yeah i still remember how awesome choppers were in BF vietnam--imagine dropping 4-5 BA's into a contested base then picking them up again to defend/capture another base. The maxim is what all APC's should be designed around--combat capable but also able to carry troops. The current APC's should be relegated to mobile spawns and field resupply like the tribes 2 jericho while other APC's act more like AFV's, bring the BA to the field then support them and bring them back.
As it is now all BA's pretty much fight until they die since they have no reason to go back to base. I say give them a starting armor then a hargel armor, hargel is weaker but constantly regens while the other armor takes a special area to repair. Now BA's will have a reason to leave the fight alive rather then dead and if they have AFV's they have a menas to do that.