So, again, just by going with a fast attack force I can limit you to exactly one control zone on hells highway. And you have no problem with this?
As for ATGMs/Tanks firing out of a forest, it's no different a situation then them fighting in the open. If they can fire on me, I can fire back, comfortably outside the range of any close-in infantry AT support. If they hide, then I'll take control of the map and shell them into oblivion. If they come out while I'm taking control of the map, hurray for me because that's what I wanted in the first place.
Any way you cut it, hiding in a forest is not going to win.
No, you cannot limit anyone but a very bad player to one control zone on hell's highway.
ATGMs outrange you and are cheaper than your VTS1s. And it's perfectly possible for a unit to defeat its hard counter if you are operationally minded. VTS1s are not the invincible stomping machines you make them out to be. They are 105 mm guns on a crappy chassis. M551s are scarier.
If I saw 20+ VTS1s coming in a mass I wouldn't even need helicopters. I'd get 10-16 rifle infantry and charge you. Rifle infantry can destroy more than their numbers in enemy tanks in open ground if you're good enough to get them close, and I have never started a match with less than 8 rifle infantry (mostly 12+ though). They can even handle tanks that are effective against infantry, like the MBT-70, a tank which scares me a lot more than the VTS1.
What ranking are you and the players you play against? I have only ever seen one rush work, it was Pact cheap spam (RR jeeps, AAA trucks and Su-122-55s). And I come across rushes every other game in my 24 hours of play so far, particularly those stupid helo rushes. I have never come across a VTS1 rush, although I have come across all-in M60 Patton rushes.