You can google “Bring Back Pontiac” and get 1.7 million hits
You can also google “Bring Back Saab” and get 59 million.
If just on the google hits alone, for every 1 “Bring Back Pontiac” fan, there are 34 “Bring Back Saab” fans.
If you insist that GM should listen to the consumers, then the consumers have spoken.
Granted, GM divested itself of Saab ages ago, but there is a larger and more active base of “Saab loyalists” then those self-described “Pontiac loyalists”.
I also don’t feel your case for Pontiac is well supported by sales figures from 20 to 30 years ago. Sales from that long ago tell nothing of sales in 2013; nevermind the shifting consumer base.
