Aside from having too few nasty players on our team as it is, I cringe at the idea of moving Smith, as he is very good on faceoffs and takes a lot of tough draws in our own end. The way Pageau, Da Costa and Zibanejad struggle in the dot (Pageau a bit of a surprise how poorly he has done), it would basically mean you need to move Turris and Spezza to take all the defensive zone draws that are important, which means we have to give more offensive draws to our bottom 6.
Maclean leans on Smith really heavily from a defensive perspective, and we can't actually afford to have him in the box 5-10 minutes a night. So yes, he has curbed a bit of the physical confrontational stuff. But he is still a nasty SOB, and one of the few we have up front.
Smith is going no where, at least until such time as we can replace him with another strong defensive center on the bottom six who can match up against the other team's top line. It's clear our 4th line is really struggling, making Smith's role and line all the more important.