First up, Not a diehard fan of V8SC, but will watch it because racecar. I don't get all punchy over some driver I watch and long to become. I have no brand allegiance.
The V8SC brand is designed to entertain it's target Audience and it does so very well. Middle income Australians with families. What do people what to watch? Things that they can relate to. So having an Australian built car to base your racer from that resembles the car in the driveway is a smart move by the series promoter.
V8SC is already heavily regulated to what they can and cant do with the car they choose to run. Control tyres, brakes, aero, basic cage design and layout, tank sizing and power. If you think a manufacture has a signifcant advantage over another due to any of the above, you are mistaken. A while back there was an uproar as the falcons (i believe) had a better aero package, to which The Holden brigade were aloud modifications to theirs to render similar results. This is all in an attempt to keep Jim Public interested with closer racing.
The other thing that everyone has forgotten, doesn't care for or has their head up their 10-20y/o import backsides, is that the Falcon as we know it know will be no longer. Ford are going to an international platform that is most likely to be FWD/AWD, with rumours of v6 and turbo 4's. To Keep a Falcon in the running, the rules must change to accomodate this, otherwise it becomes a 1 make series. This in itself looks to be a big factor to how the ruling and plans for COTF has developed, which also means that it opens the doors to other manufacturers.
Just my 2 cents.