makes no sense to trade Iguodala and keep a rookie that hasn't shown much

Is Iguodala a franchise player? - No
Does Philly have a chance to seriously compete over the next 3 years as constructed? - No
Is Iguodala substantially more expensive than Turner? - Yes (roughly $9 million more a year through 2014)

As soon as Philadelphia can get out from underneath Brand and Iguodala's contracts, they can begin to rebuild. Until then, they are dead in the water. Just look at the Knicks. They were perennial losers until they completely overhauled their roster. If you're a bad team, keeping good (but not great) players with big contracts is a sure fire way to make sure your team is irrelevant.

Like I said, makes no sense to keep Iguodala.