What could probably keep people quiet was some city dependant quest lines at every 5-10 ranks.
Would give us something to do, show actual background story of Eorzea and keep us immersed!
^This. That's the only thing at the moment that would make me happy. Lte me talk to a NPC, let me see a cutscene about what's the problem of the NPC and let me help him on that. Maybe some fame related thingy to unlock some other quests or helping the NPC in that said quest would make this NPC say "Hey, thanks for help! Actually, I know someone that also needs help. would you mind go talk to this person".
In my opinion, people just need other things to do that leves/behest/craft/gather from rank/level 1 to 50. Dynamis should be kept for much later when many many more people are at rank cap and when the cap is increased as this should be endgame stuff although I wouldn't mind a 'mini-dynamis'-like thing for lower ranks but adapted to the empire storyline.
To add to those, if you can get this DeLorean up to 88 MPH, you'll be able to play this game in 2019 when they've finally implemented mounts.