Yes, every shooting guard that is 6'5" or taller will take advantage and that's a majority of the league, we saw how Millsap and Boozer faired against length, they may have put up nice numbers but when it came down to winning in the playoffs, we got killed. Plus, if Marcus could shoot that would help make up for his lack of length and he can't even do that. Defense wins championships, teams will just shoot over the top of him and force Marcus to shoot outside shots.
I'm not convinced there are many SG's in the league out there right now who can effectively take advantage of a size mismatch over Smart. He is a tough, physical defender.