I worked in a Honda Dealership, got to the platinum level, hall of fame status... walked away, best decision in my life.
I was 21-25yo. There were two older guys that still work there. One started the year Honda Auto was launched in the USA, the other started the same year I was born. They both told me, and the other younger guys to run, run far away, and run fast. Up until the late 90's they made good money. Services were plenty, hours were easy, cars were lined up. But neither of them, despite getting standard raises, have not made more money per year than they did in the late 90's. So say, in 99, they made $60-70,000, that was damn good money, but come 2014, they are still making $60-70,000, yet they are getting paid more per hour.
Contrary to what those UTI commercials tell people, cars are getting easier to work on. Electronics and computers make everything super simple. Very little in a car these day requires more to diagnose than a, "does it work, yes or no?" It either has power and ground, and works, or it doesn't. If it has it, then **** is broke, if it doesn't have power or ground, then whatever sends that is broke. It's not rocket science.
It's funny how these old guys are like, "jeez, I don't think I could ever understand all these crazy electronics, I'll just stick with my distributor and carburetor." And I think to myself, I have no clue how the **** anyone really can really understand those things work.

There are guys out there that can make a carbureted engine run as good or better than the average fuel injected car, but those guys are one in a million, the other 999,999 would be better off with a stock efi setup.
Another interesting thing that you see is a lot of the real technical stuff is getting pulled out of the field. Auto ****** shot? Chances are the manufacture would rather just send you a replacement and you send back the bad one for them to rebuild themselves, than rebuild it in the shop. Honda did this a lot, the official diag was pretty much: ****** throwing a code? Yes. More than 20,000 miles on it? Yes. Swap for new transmission.
Technicians are needing to be less and less skilled, and just able to swap parts... parts that are likely already being installed by machines in the factory... how much of a career future do you really think there is in the field when you think about it?
My brother is an electrician, of all of the people I know who are in the trades, it seems like the electricians are the ones that are doing the best. If I was going to go back into the trades, that's where I'd be headed.