I'm all for trying this approach, sure. And I think I'd much rather have Millsap at the 3 to start the season than trade him for an older, costlier and (quite possibly) less efficient Danny Granger. It may well work.
I entered this thread to challenge the notion that Big Al is an elite offensive low post player. He has done very little in his career to live up to this representation. He is not (as of right now) an elite offensive low post player. Maybe he hits the weights this offseason with Millsap, comes back stronger, more aggressive, and magically more intelligent. It's possible, and I hope it happens.
As I've said before, unless an obvious trade comes the Jazz's way, I'd rather stand pat and see what a starting frontcourt of Favors-Big Al-Millsap can do, especially since the Jazz aren;t winning anything next year.