I don't think this is going to be the big problem that you imagine. It will get players utilizing some of the other methods to reduce/avoid the fees, such as going to Limsa to take the East Aldenard ship to Kugane for 300 gil (or 450 if we see a similar increase to the ferry amounts) instead of paying 1440 to teleport.

Aetheryte tickets will continue to exist as well, though it sounds like they might be switching to some sort of discount system (reduce teleporation fee by 500 gil/50% or whatever) instead of replacing the teleport fee. Those are very easy to get through Allied/Centurio Seals, and players are sometimes earning gil at the same time they earn the seals.

It's not the teleport fees that keep players poor. It's a rare quest that doesn't reward gil in excess of any teleport fees involved during the quest. It's the bad spending habits that keep them poor.