I know I could be in the minority, but they can take him if he wants to go. Though he has been decent, he certainly hasn't been anything to brag about as an OC. That's not to put him down, it's just that he has been an OC for year, and in the year, the game plans have not been anything special.
In the end, I see him turning it down. Why does Oakland have a h*rd-on for him? Simply cause he OC'd Brady & Co. for a year? Mangini, while only having a year of experience as a DC, at least was a student of Belichick's for a long time. Who has McD been a student of? Weis?
In the end, even if he goes, I would actually look forward to another OC. And I am not putting McD down. It's just that his departure isn't the same as a Weis/Crennel/Mangini to me.