Cons dont have to rush anything. Thats the problem. They win long range, so Volks have to close distance, but while advancing you are likely to lose models cause volks have omegabad rec acc. There is no way that volks win over 7man cons. But they dont have to. There are Obers and the 7man upgrade comse way later than Stgs so Volks have a window of pportunity there.
Cons are designed to carry you through the whole game.
Volks are designed with obers supporting them from mid game onwards.
Cons start weak and become strong.
Volks start strong, peak in early mid game(light vehicle phase) and fall off late game.
And both work fine and as intended.
Cons will be slightly weaker post patch, but the overall dynamic between mainlines isn't going to change.