Poulemeister, that's part of the problem: marketing! They often don't try to develop a sound product, instead they repackage the same stuff under different name, hoping to please as many peoples with the aestetic side instead of pleasing on the performance and ability to do what it should do reliably.
The alliance with some europeean/japanese brands for some models is the only way American car makers found to get something decent on the market. Even then, they often find ways to ruin them.
I was only talking of models sold in North America so, the fact a model exist elsewhere under a different name is irrelevant. What's relevant when talking about model clones is the HUGE structure required to change a car's front grill and lights and sell it under a different name, in a different division, often across the street.
Also the way American vehicles are marketed is a problem. Option groups to the ears, named with criptic numbers, where even the dealer can't properly explain what's included and how much will that sunroof will finally cost you. They streamlined the process in the last few years but it's still harder to figure-out than Hondas.
--
Daydreamer, the GM dealers closing in 2010 would probably love to get a different brand but, ALL brands, including Japanese/Europeans are seeing a decline is sales. It's proven worldwide peoples tend to keep their car longer. For the soon-to-be ex-GM dealers to go with a different brand, there must be a brand who's ready for expansion. I heard Honda was the only car maker who broke-even last year, saved by it's motorcycle division.
What will likely happen is most will go independent and still continue to perform service since new cars sold in 2010 will likely still be on the road in 2020 and will need maintenance. They will also specialize in selling used cars. When the economics calm down, then there might be other brands available to the strongest ones remaining.
The remaining dealers will see their volume increase and might even buy some of the decommissioned ones, turning one of the location in a service-only shop and the other in a sales-only place. For those side-by-side, it's a pretty valid solution, some have done it before,