I am keeping my beard until I see if I have a prominent chin under my fat. I think that the answer is no (based on pictures of parents and grandparents), but none of them ever had beards and still looked good.
However, when I first let my beard grow, I didn't do it to hide my chin, I did it because I thought that the idea of a beard was cool and I like grooming and trimming my small beard once a week. It's only once visiting /fit/ turned into a habit that I started to look at other people's chins and think of my own beard as some sort of weird coping mechanism which I don't like. So yeah, I'll just wait out my fat loss and see where to go from there, I am not really obsessed with my jaw like some people here seem to be.