it's possible that your camera will soon develop some issues from the shock, but then again, it's possible that it will be fine.
hey, just a thought... you could use some black silicone sealant on there to block light and water. functionally, it would be as good as new if the chassis is truly the only thing that got damaged.
look for black 'RTV' sealant in a big hardware store like home depot or perhaps an auto parts store.
(possibly first take some ~400-600 grit sandpaper if some of the paint is peeling off around the damaged area)
a slightly ugly fix, and there will be the looming timebomb feeling. it's hard to say that there is not an increased risk of sudden failure from that drop. but if you have a second camera that could work in a pinch on a job, this could be a suitable fix if you want to save your insurance for the next time some drunk guy bumps into you.
but yeah, if you want to use your personal insurance on this but need to keep using the camera to finish up your current jobs, you could apply the fix if you think you might be shooting out in the rain or something.
you could also just put a piece of duct tape on there... better than nothing.