Two years ago traded my 1994 Jeep Cherokee in for a... 1996 Jeep Cherokee. Yes, it's fuel injected and computer-controlled, but everybody from Autozone to Hector at Segundo Auto (a traditional, highly-skilled "Mexican" mechanic from L.A.) has a reader that works on it. Can I fix my Jeep? My eyes are horrid and I'm sick and weak, but up to a point, yes. I still know how, and I still do the light stuff like tuneups and a/c recharges -- essentially annual service. Plus belts and hoses, which I routinely change because as all taxi and limo owners know, rubber is responsible for at least 80% of all road breakdowns. (check my login name - I used to own a small limo service.)
Brakes and more physical work? Hector needs to feed his kids, and he has a hoist and air tools -- and doesn't rip us off. Like when my wife went to the Hyundai dealer for a $19.95 oil change and tire rotation and they gave her a $2000 estimate for a 60,000 mile service (includes timing belt change) and Hector did all the work for $200 - not counting the timing belt kit, which includes the serpentine belt, water pump, and front main seal, that I got online for something like $120.
The day I can't fix my own car or hire someone like Hector instead of going to the dealer is the day I stop driving. Hopefully I'll be dead before things get that messed up.