I don’t think it would. Since bringing back Pontiac today virtually guarantees platform sharing, it would just be a small percentage of a production line’s total annual output being Pontiac’s; that’s doesn’t assumes there would even be a spike in demand for the defunct brand in the first place.
For example, it could be 100,000 cars that would have been Chevrolet’s anyway. If 15K are wearing a different front fascia, that’s just 85K chevy’s that share not one significant difference to seperate them from their supposed “performance brand” counterpart. It’s also 15K less Chevy’s come the end of the year. GM isn’t benfiting, and neither would the workers, they’d still work at the same rate churning out 100K cars irrespective of the badge on the front.
Furthermore, GM doesn’t need the increased marketing costs just to relaunch the brand that more than likely won’t increase sales. I also don’t think reheated G8’s or Solstices will do the trick.