Bit of a slap in the face to all the buyers of HSV who paid top dollar only to have a new "better" model sell for less. Would kill the resale on the older models... Plus apparently a lot of HSV buyers are not first time buyers (EG the guys buying HSV have bought them previously).
As stated, their not having any problems selling cars now so why change the formula?
Plus if the bring out the supercharged version now, what are they going to top it with next year? You cant keep increasing power forever as the driveline wont handle it. Expect only "minor" power increases in the coming years.