Scion - Toyota - Lexus works.
Honda - Acura works.
Nissan - Infiniti works.
Ford - Lincoln works (why do they need Mercury anyway?)
Saturn - Pontiac - Chevy - GMC - Cadillac - Saab - ETC? WHY??!!
Chrysler - Pfft. The ME412 was 20th century, go away already.
GM should have went with a Good/Better/Best model. Saturn - Chevy - Cadillac. The other brands are freagin useless, and I didn't even name all of them.
Hyundai has gotten significantly better. Mitsubishi, bleh. Who cares about anything but the Lancer Evos. Subaru has improved its cars as well. BMWs really are great cars.
But, I love my current 06 Acura. Won't trade it for anything.
I had a 2008 MDX that was a total Lemon. Being in the business, it did not anger me, and we finally "unwound" the deal after 4 months. The vehicle had a new transmission put in it, and was sold at auction for $28K.
Considering it was $48K new, that was a great deal for someone.
MY "work" car is now a Ford Flex, but I love the new TL. I know a lot of people think it's ugly, but I think it's great looking.
Looking at your ideas above, let's look at just the GM line up.
I don't even think Saturn needs to be around for anything. Make it Chevrolet-Cadillac. This idea makes a lot of sense.
In our area, we have a population of appx. 300,000 people. We have one Scion-Toyota, One Honda, and One Nissan dealership. We have Three Ford, Three Chevrolet, Two Buick-Pontiac-GMC and 6 Chrysler/Dodge dealerships.
One Chevy Store, One Caddy Store, One Ford-Lincoln combo, and once Chrysler "4-Pack" (Chrysler-Jeep-Dodge-Dodge Truck) makes sense to match the single Toyota and Honda outlets.
Here is the problem ... how do you compensate the 6000 Buick-Pontiac-GMC-Saturn-Hummer dealers across the country ?
Franchise law makes this very difficult ... in fact, franchise law requires the manufacturer to compensate the dealer based on the highest possible evaluation.
Fortunately, this problem is centered in the north-east and some in Ohio-Michigan, with a less concentrated dealer body in the south and west.