You know this for a fact or is this your opinion? Not much point in merging if there's no synergies! Come on guys, when you're not fighting the other guy for his premium fliers and market share you move the aircraft to maximise yield which means American will be asking "Do we need all four hubs serving or is there duplication?" Also given the B757s are going with no replacement, anything which won't fill a B763 gets what exactly?
Given MAN-CLT has zero track record and you're not on the board of American, let's not be counting chickens yet. Aircraft will be used to maximum effect to compliment each other, not compete as the current set up does. Something is likely to give, Delta right sized, Continental / United swapped a EWR for a IAD (yet went three daily at EDI), no one knows what the post merger American will do at MAN, but on past experience, expect some consolidation.
Forgive me if I mention the emporer's lack of clothes.