No, he isn't that high profile, but it still isn't something that Bettman would welcome. For Kovalchuk himself, and for what him leaving could mean for other players down the road. When's the last time the NHL has lost one of their best players to another league?
I actually suspect the league might be more ok with this as they can shrug it off as an unintended result of the old cap-avoidance contracts they fought to eliminate in the lockout.