Well, I guess that I'm just old, but my neck still swivels my head around, and my eyes can still focus on mirrors, and my brain can still figure out when I have a car sitting at my rear fender. It's not a blind spot, it's a lazy spot. And you don't need fancy electronics or little beeping noises to make sure it's safe to change lanes. Use your brain.
Of course, even the cheap cars can give you cute ways to tell you your car shouldn't pull into the car beside you. But they can't give you the power to actually pull out and pass.