Given the user's history and current behaviour, even after the year-long ban, is there any reason that a permanent ban would be out of order? As I understand it, the only restriction on the ArbComm's banning duration is self-imposed.
I would oppose such a move. Most people who get banned are probably young and immature. Give them a year to grow up. And if they need another year when they come back then give them that too :)
Regards, Haukur