When 7.0 comes out and all the new added skills for all of the jobs have in their tool tips dynamis instead of aether, feel free to say 'I Told You So'.
The point about new zones and areas in the map are a good one; FFXIV is generally very good about revisiting old lore and places instead of abandoning them for the new thing. Like the primals, they will often re-contextualize and add to with additive retcons, but that's in part because this is a MMO.