Nah.
If I wanted to watch fighting, I'd actually watch people trained to do it who are... you know... actually good at it. Not guys throwing sloppy haymakers while struggling to balance on skates.
Concussions are up because players are bigger and faster than they were in the 80s, and the rule-changes after the 2005 lockout increased the speed at which players could skate through the NZ into the OZ. Combine that with a crackdown on obstruction that used to allow opposition to slow players down with hooks and holds, and you've got guys hitting each other at speeds you couldn't otherwise reach without a vehicle.
If you want to reduce concussions, you eliminate fighting completely (already happening organically as new generations grow up playing hockey with very little or no fighting), and you take an IIHF-style hard-line against headshots.