He's done with the SEL, can't improve fast enough there anymore. He's leading the league in points among defenceman (6th among all skaters), he's quarterbacking one of the top power plays and he's logging 25+ minutes in any tight game that his team plays. (Averaging 23 or something)
However, his problems adjusting is gonna be handling the pace of the NHL, the bigger, faster, stronger forwards and adjusting to the fact that he can't take all the risks offensively that he does at home. He's giving away the puck a whole lot, which might not go punished very often in the SEL but in the NHL, if you give up a lot 2-on-1's or 3-on-2's, you're gonna get scored on a lot.
I wouldn't say he's ready to step into the NHL if we want to do some damage next season, but if we're going very young in a "rebuilding year", he'd be there.
By the way, do we really like our defence to be with all three of Gonchar, Karlsson and Rundblad? Too similar and cover too many of the same weaknesses. Need very strong players on the left side to help.