Something else: I think you should consider raising Airborne mp reinforce cost more, but decrease their manpower upkeep instead. Makes loosing men more punishing to airborne spammers but does not affect using single squads combined with riflemen.
The thing is, they already have the highest reinforce modifiers along with Rangers. And quite frankly those modifiers are out of proportion. Increasing reinforce costs in general puts more power on snipers.
US army uses high upkeep costs on high value units (and especially with the ones with the good veterancy).
The army that uses high reinforce costs and lower upkeep costs is the PE, and we all know how flawed the design of it is. => Do well the first few minutes, get tons of manpower. => Lose one fight at start, lose game. You think that's good game design?
So basically your scenario would be: hell I just spam Airborne Squads until my force is bigger than his and I rape him. Before my spam is complete I will just not use my squads risking to lose 50mp per guy.
Upkeep is a great way of keeping unit spam (and cost efficiency in check.
Reinforce costs used to be much lower back in the day, but people spammed those forces with free fire up and destroyed everything with their blobs. They were considered OP because easy to use and very effective. Then they got a series of nerfs, especially with the release of OF (due to these units being very effective vs PE). Zooks / Recoilles got some nerfs vs vehicles etc ...
To use these squads nowadays in 1v1
vanilla matchup, it's just suicide. You manpower starve yourself to death. Airborne still does good job vs tanks as a support weapon.
I'm certain that reinforce cost decrease won't make the unit suddenly OP in vCoh matchup.
Tl;dr
I'm right, this guy idea is a bit flawed.
Reinforce cost decrease won't make Airborne OP in vCoh matchup.