Go for it! For all the reasons you stated and for the chance to go out and meet more people. You never know what you might find. Jen is right, there are lots of jobs that only need a 2 year degree. And many dovetail into ones that could use a 4 year degree. There is really no down side. Other than time spent on it, and you have that so go for it.
I am bored so I think I will go home now.