The biggest issue we are NOW going to face is that lower level dungeons will be populated less. Most people will be just leveling fates due to it being easier than using the dungeons, unless for story which can be done with Synced down FC members.
It's going to put a huge burden on new subscribers to populate those lower dungeons on a constant basis. Which, if anyone notices, isn't exactly easy when your game time is during the hugely late hours/early morning time.
There has to be a mechanic to push people into dungeons and into other content so that new subscribers can feel like they are getting somewhere in game, rather than no where for over an hour.

I understand yes its a gameplay thing. However it'll injure the game as a whole if you can't get new players into end game if they can't get their story dungeons done, or lower population servers have this issue, which we do, and cannot recoup from it.