He also cannot play 20 minutes a game anymore for 82 games and then go into the playoffs. Give him 15 minutes a game and I can all but speculate like crazy his numbers would actually increase. He was amazing at the start of the season for the same reason Vanek was...they were in shape and not under the rigors of being 30 games into an 82 game season.
It is nothing to do with him being a terrible player, but because he is aging and that does mean his minutes need to be limited and used wisely. Same with Suter's. When you have players like Haula who can play 20 minutes a game competently on both Defense and Offense, you would be foolish to not at least give those lines more ice time to conserve your vets for when you need them (ala maybe the last 5 minutes of the game when you need them to be refreshed and ready to play).
I think you have a point. I don't know if Koivu's pride can handle it, but i would like to see the Wild limit his TOI during the season. Sort of like how Popovich limits Tim Duncan's minutes.
Same goes for Suter, btw. There is no reason at all that he should be playing over 25 min/game.