Well, thanks to my 'understanding' of human psychology, I can guarantee say he probably [b]will[/b] return, out of nostalgia. (Then, move to RP Guild.)

Unfortunately, what I can't say is [b]when[/b] he'll come back. I mean, by the looks of it, he's been bored of RPing for several months now. It's hard to say if he'll come back at all due to other factors, such as a vow to stay away from the evils of the Internet.