I see potential the other way around. Arriving in Florida via Amtrak and catching Brightline. That type of person may be headed to Orlando or Miami and Jax is only used as a transfer point. This is how things worked historically at the terminal and why Jax became known as the "Gateway City". In Jax, JTA is supposed to break ground on JAXIS (formerly the JRTC) later this year. Funding is already in place and the anticipated completion date is 2019. So assuming regional trains come into the old Jax terminal in the future, a passenger would have the option to transfer to the Skyway, BRT, local bus, etc. I personally don't think Jax is so bad off. Tampa is the one I really worry about when it comes to connectivity.