What I'd really like (even two+ years down the line)

Chocobos in cities you rent and take out in the wilds. Rough pathing that only chocobos can traverse, can lead to content/camps/dungeons/nms

player owned airships for reaching land unable to get to by foot or chocobo. vistas/temples high up in the mountains, islands on the water

Company airships for taking large groups of people from your company to location of content they want to perform.

city airships that simply go from city to city

more boat paths with fishing and new land areas like bibiki bay->pronongo or phauneut channel in XI

as for airhsips and endgame to keep things unique, if it were an endgame event like dynamis that only an airhsip can take you- call it rough flight, and say your airship can only take you once a day then it would "need repairs to be ready again"