With a Post-War POD up to the 1973 Oil Crisis, what if General Motors begin streamlining and phasing out certain US marques (whether due to low-volumes or reducing product overlap) as part of reorganizing its marque portfolio?
Which GM marques would likely be phased out and on what basis, also could the remaining marques be capable of adequately taking over the positions of the discontinued marques?
Additionally what impact would such an action have on GM's status among the Big 3 US carmakers and could such a streamlining of its marque portfolio have benefited GM in the long run?