I doubt Miami would be fare any better than Detroit, Phoenix, Dallas, Las Vegas and Indianapolis.
Long Beach was usually good until the Poison Dwarf decided to up the fees and lose out to CART, and FWIW I (just me, myself) think that COTAM is a decent venue for a 'modern' circuit, it works well for cars and bikes while the location seems to be good when it comes to the audience.
As for drivers being involved in 'designing' a circuit..........I don't think so.
Long Beach was usually good until the Poison Dwarf decided to up the fees and lose out to CART, and FWIW I (just me, myself) think that COTAM is a decent venue for a 'modern' circuit, it works well for cars and bikes while the location seems to be good when it comes to the audience.
As for drivers being involved in 'designing' a circuit..........I don't think so.