While it would certainly improve our collectibility to have GM stop producing Challengers, the Platform being produced at Brampton is a high quality vehicle. Chrysler has been able to sell all of the cars produced pushing production up with multiple shifts. I have driven all of the cars and compared them to the competition and they are generally superior. It helps that Mercedes designed the suspension (really the whole platform). But this is a line that someone will keep, be it Chysler/GM or whoever.
My opinion, if GM merges with Chrysler they will keep Dodge as a separate performance line. And Dodge certainly has performance. Truck lines may merge, minivans may merge, but the Brampton plant will produce mid to fullsize cars for a long time. The Challenger is not a compact car. Mine barely fits in my garage.