I think there is a chance MB is back in the rotation next year. He's not going to be in the league for much longer, so it's not like he going to reject the offer and have another team sign him for 1 or 2 years, where said team has to lose a draft pick. Not many teams will be lining up for that deal. He might just look at the team, think it might be stacked offensively and stick around.
So here is how I see the rotation.
Stroman
Buehrle
Osuna
Dickey
Estrada