I don't think that it makes sense to release both a caster and a ranged dps in the same expansion. It's like releasing a tank and a melee dps together. I know the temptation is to keep up the same pace of job releases, but with 6.x due to wrap up the present story arc, there's going to be a break in momentum going into 7.0. You could always throw in a limited job into the mix, but I want to see them clean house before the story picks up again.

I think they should pick one job, and focus in on renovating the current game systems. Fix movement jank and bugs dating back to 1.x that are holding the game back. Make movement and positioning more responsive. Balance out and make adjustments to the 20 or so jobs that we currently have. We're going to be approaching the 10 year anniversary of ARR by the time that the expansion after Endwalker comes out. It's time to do some serious upgrading.

A DoT based caster would be an excellent choice, now that SMN has vacated that seat. I think that a lot of people are thinking along those lines with Time Mage.