This is exactly what I'd like to see.
My issue with being limited to these four mostly bad units is that the game just doesn't end if you lose War Factory and Barracks. If it did, I wouldn't care, losing one building hurts but it's not the end. Losing both is awful, at that point you really have no chance of winning, even if there's a Helipad if you're GDI. Nod has slightly better air units for killing buildings. Even still air units either have crippling drawbacks (ORCA Bomber) or don't out damage even a handful of basic engineers repairing the MCT.