Depends on what changes we are talking about.
Its lethality is heavily dependent on being stationary (almost all the damage is in the 50cal...which has 0.375 moving accuracy) and the Canister Shot. Locking away either the Canister shot or some of the DPS behind vet would still leave it with its excellent HP, Speed, and Vision.
Likewise if you go after its survivability, its going to depend on how much is taken away. A Greyhound with canister and 50cal at a Stuart timing is going to be very scary, and not a lot of AT weapons will be on the field at that time. (222 would actually be able to hunt and kill it though, Greyhound only narrowly wins with its current stats)
Your reasoning seems quite weak, everything you said minus health can easily be gated behind Vet. Speed and vision Vet 1, restore DPS behind Vet2. The fact that a 222 can scare it off while costing half the gas is plenty. Ost has faust, At gun and mine along with shrek's available. If the player chooses to invest or not is up to them. Just as a USF player goes LT they made a decision to forgo AT gun. OKW is an even better position to fight back with Lucas, puma, faust, shrek and rak.
Also canister shot is fairly useless due to its range. You are setting yourself up for snare