FLL would be great over MIA, but there isnt a hope in... they'll not go to MIA.
The lure for potential pax, connections, facilities, partners etc is too great
Disagree as JetBlue have a hub at FLL to South American/Caribbean and I don't see MIA unless AA agree to code share something I'm not will happen.
Having being to both airports MIA is by far a worse airport but FLL wouldn't be much better.
Both cities are only around 20 miles apart.