I actually had a 3.8 GPA before my last semester. Going back immediately after dealing with a brain tumor/surgery kinda screwed things up, though I should have been theoretically unaffected by it.
A friend of mine who is far more successful than I'll ever be and shouldn't even be using "go back" and "school" in the same sentence, just went back, and after a semester, he's done again. So I dunno.
I think there have been some pretty big changes with how companies, jobs, and credentials work ("High Res Society" kinda stuff), and the culture will lag behind 10-20 years.
I'm on of the only few with a technical education and I always have a hard time explaning that "yes I did go to college" (I'm from Sweden so it's called University but its not the same as in US), "but I did not graduate".
Their eyes flicker, and I'm instantly degraded to that basement guy with big computer screens they know so well from highschool.
I know very well that my life in very many aspects would be other peoples envy. I organize my days myself, I pay my own salary and I can divulge on whatever project I choose.
However, many people equate a steady paycheck with safety and responsibility. Two keywords that are atleast here in Europe quickly becoming very hot.
I definitely feel like I've managed to be "successful" without completed college (yet) I make a decent salary, and I can see that growing in the horizon. I also feel well respected and needed by my coworkers, and family. However I completely agree with the opinion above. While part of me wants to complete it for the sake of ensuring future employment. My main reason for wanting to finish is to gain that last part of self confidence i'm missing.
A second reason, one that is less mentioned is more social. I try to skirt the issue when talking to people, but (even more on the east coast) people tend to think of myself differently when I tell them the truth.