I know a lot of homeschoolers who end up as college graduates, but of the grown unschoolers I know personally, only about half are college students or graduates. Most are still in their late teens or early twenties, so I don't know what will happen later, but they don't see it as a requirement. Some are just hanging out doing what they like and working jobjobs to pay rent, some are doing what they love and making money at it. One got a high-paying computer job at 18 and moved two states away, and everyone misses him but he seems happy. Actually, they all seem happy, especially when I compare them to my 23 yr old sister and her friends. They are about the happiest yoing adults I know...
OTOH, I do think college is different than K-12 school. You're treated as a competent human being, for the most part, and an independent learner. The further you go, the more true that seems to be. You also have a lot more freedom about what you'll learn, who will teach you, and when and in what format the class will be. It's more like signing up for french lessons, or dance lessons - actually, one of Rain's hsed teen friends takes tons of dance classes at the community college because it's free for her as a high school student. Not all college students are in it for the degree, and I think unschoolers are more likely to be there for the learning, not the piece of paper. If you don't want a degree you can just take what you enjoy...
As unschoolers, we're not against teaching, or formal learning situations. Rain's ballet classes and voice lessons involve both, and she's done some formal biology classes. The difference is that she's in control of the situation, and she can leave the class or lesson if it doesn't fit her needs.
Dar