All what incentives that are meaningful to most players?
A house is only a meaningful incentive if you don't already have one but have a strong desire to get one.
Gold Chocobo feathers are only a strong incentive if you're a mount collector without one of those mounts or use a lot of the expensive GP dyes.
Reduced log in queue times are only an incentive if the player is currently experiencing long log in queues.
Access to Road to 80 for 90 days is only a strong incentive if you have multiple jobs you still want to level on your character and you are willing to do that leveling only on your new home world (the buff is disabled for players who transferred characters while off world, only characters created on the new worlds retain it off world).
Counter those incentives with the disincentives:
Poor marketboard economy on your new world due to lack of listings and buyers being able to go off world to get what they want.
Having to leave your old FC you liked.
Getting cut off from your social circles unless you leave your new home world to go back to your old one.
Getting cut off from your new FC, retainers and house while you're off world.
Risking world visit and data center travel going down while you're off world so you end up stranded until they're fixed. The potential for long wait times for those system queues cutting into the time you have to actually play the game.
You're committed to that world for 90 days even if you quickly decide you don't like being there.
I think it comes down to a player's personality. Those who want more of a solo experience will find it easier to transfer. Those who find the thought of helping new worlds get established exciting may choose to transfer. Those who have strong ties to their current worlds and social circles probably would not want to transfer.
Players have this tendency to ask for improvements via creation of new worlds or allowing free transfers - then think it's up to others to take advantage of those things so their own experience improves with no inconvenience to themselves. WoW players saw this happen every time Blizzard offered free transfers off Full worlds - few would actually leave and so Blizzard finally stopped bothering to offer them.