Upload & Sell: Off
Your friend obviously has little or no interest in DSLR photography...so I don't think 'guilt' will work except to make your friend think you're a just pressuring him for no reason! Maybe your friend would like to use a smaller more compact camera like a lightly used G11 instead...I'll tell you what...I just happen to have a lightly used G11 which I am willing (as a favor) to do a straight-even swap for your friends kit!
Hehe. Already tried to tell him that as well. Of course to the P7100, to convert him to Nikon
Invite your friend on a photo shoot with you.
I would but he lives in another state, which is why I can't simply take a picture of his gear.