Since Pia Sundhage joined the ranks of the unemployed when WUSA shut down rumours have been ripe on her taking on a (male) swedish premier division club. Pia herself comments: - I'm ready. The big question is if the guys are ready for it.
I believe she has coached the men youth teams before as well or was an assitant. They should do it. Great student of the game.
When you look at the results (Boston finishing at the top of their division) you'd have to say Pia was an effective coach with the Breakers. Men coach women all the time. I can't think of any reason a woman couldn't coach men.