If only Steve Jobs, Bill Gates, and Mark Zuckenberg hadn't dropped out of college. They might have been able to start some huge companies and have billions of dollars to donate to help people, instead they are janitors somewhere.
Wait,

That's a non sequitur. As has been said, a lack of a degree doesn't equate to being "dumb" or relegate someone to poverty.
The question is, does a degree make a person smarter than they otherwise would have been.
Furthermore, none of those people you mentioned, despite all their money and accomplishment, can practice law or medicine. You have to have an advanced degree to do that. There is no other way to learn law or medicine then by going to law or medical school (with the exception being the state of California which doesn't require a JD to sit for the bar).
How is it a non sequitur? I was responding to the specific claim that not having a degree results in a negative impact on society, not trying to debunk the value of degrees in general. If you want to jab at my points at least do so in context.
By the way, the only thing that keeps anyone from practicing law or medicine is the rent seeking of the people in those professions that insist on the government imposing standards that make it prohibitive for people to get involved in them. A degree does not make anyone a good lawyer or a good doctor, yet we have been trained to think it does.
As far as degrees making people smarter, the correct answer is obvious, sometimes it does, and sometimes it does not. It obviously did not help you, or you would not be here trying to tell me that me pointing out that people without degrees have contributed to society somehow proves that you are smarter because you have a degree.