It might not be the truth and only but the truth but my speculation is that he became disgusted with the community since Gavin showed it off to CIA, and become even more disgusted when he saw how twisted we are with our overly speculative, wanna-get-rich-quick-while-jerking-off mentalities and such.
My impression is that he doesn't give a single shit on any of us and more tragically even about Bitcoin. If not a prank, his recent post on not being Dorian, clearly shows he stepped forward to defend a man that was in REAL danger of being killed for his supposed wealth/ worshiped to death by the bitcoin fanatics.
Moreover, Sathoshi gave everybody the instrument, a decentralized currency but we somehow started to do it wrong (see MyBitcoin, Bitcoinica, MtGox etc)
But don't worry, Bitcoin will not burn in hell, only we will! (in a max of 90 years or so, and even less for some of us). And lets a keep a toast for for MtGox - Bitcoinica incidents as we love people being scammed of off their life savings.
PS: Haven't lost any bitcoin with the Mtgox fiasco but I have lost faith in the community. Protocol still works though.