I agree that it would be nice if there was arty and air-limit.
I disagree. Players with that much arty/helos tend to overspecialize, leaving little to cap zones and less to hold them. The trick is to not spend your whole load at the beginning of the match and get a couple recon jeeps or a reco helo, scout the enemy out to see his unit composition and his movement.
if he went arty, you can cap zones with ease, as arty is expensive and inaccurate without scouts. After your zone control for a couple of minutes, you can afford units that he cannot, and he is forced to stay at his base because of FOB supply or to spend money on log trucks/helos to resupply instead of units used to defend his position. Just don't group your units up and provide air cover to swat down scout helos.
if he went AA, hide one of your command trucks in the woods (very difficult to spot), and purchase AA. Tunguska is good as it has an excellent SAM firing rate coupled with good AA guns for when they get too close. However, it is about the same price as a chapparal + gepard, and it provides one target instead of 2. NATO didn't have an all-encompasing AA defense, and had to rely on two systems that specialized in area of coverage: missiles for the far range and AA artillery for close range.
Buk's are good area denial systems, but they are too slow to fire and carry too few munitions for a sustained attack. I'd go with tunguska or OSA + Zsu.
Essentially, if your opponent went heavy on helos or artillery, he has invested a lot of his points and will lose the ground war/zone control. All you have to do is swat down the helos/spread your units out, claim his undefended zones, and earn more points than him.