Don't care. McCarthy still got a team to the Super Bowl using his system and took a team to multiple NFC title games, so I'd rather see him try than keep using a system that has failed to get us past the divisional round. Maybe he can't do it with Dak at QB, but at least we'll see that instead of seeing the same thing we've been seeing.
I think it's weak to discount the play-caller because of who the QB was of a Super Bowl-winning team. With almost all of the teams who've won Super Bowls, you could say yes, but he had (insert Hall of Fame QB). Do we discount the play-callers for Aikman, Montana, Walsh, Brady, etc.?
How good will Sean Payton's system in Denver be without Brees? We don't know, but when you hire Payton, you expect him to install his system instead of just keeping the previous coach's coordinator and running the existing system. Same for me with McCarthy.