^The state is currently looking into it (
http://volusiaconnectorstudy.com/about_study/ ). Considering Sunrail's pitiful ridership and the amount of wetlands between DeLand and Daytona, I suspect the ridership estimates will be low.
Luckily, there may be another option. The Florida East Coast (FEC) Railway's mainline between Miami and Jacksonville goes through downtown Daytona, roughly 1 or 2 miles west of the ocean. In the event that AAF is extended to Jax, them adding a stop in Daytona accomplishes the same thing.
The largest differences would be the cost being funded with private dollars and the trip between Orlando and Daytona being much faster.