Here's my 2 cents worth
we used to have maintenance to do now we get the problem jobs that no one else can fix . we get these jobs after they have been everywhere else trying to avoid coming to the dealer . i only for see this just getting worse .. the aftermarket picks and chooses the work they want .. (read that and the easy stuff) and the dealer gets things that take a lot of time for diagnosis .. and i do charge for this ..
my predictions for GM .. someday much smaller dealer base .. selling Chevrolet and Cadillac .. maybe Saturn .. everything else gone
ford.. ford and Lincoln everything else gone ..
Chrysler .. gone or merged with nissan/Renault
happy new year
paul