My 2 cents on booking.
Please do not tell people to NOT reserve ahead of time so FD wil be offered. Its bad advice.
If you are planning on going to WDW no matter what , your best best is to book in advance . Many resort hotels get booked up 6 months out. (Poly has no regular rooms for many weeks in November already) . If you wait to book its possible all the rooms in you selected resort and room category will be unavaiable.
If you cannot travel UNLESS FD is offered then I suppose you have no choice. But to suggest other people should not book a major vacation just so we can have a better shot at FD is just over the top.
The avaiablilty of FD will always be dependent on the need to fill rooms, just dont put you magical vacation plans in jeopardy waiting and waiting and waiting for a deal that might be very limited at your choosen resort.
Again my 2 cents.....