Predictions for job(s) in the next expansion?

[Sairys]

Adding dancer as a physical ranged DPS balanced the physical options vs the magical options in the whole ranged DPS bracket.

I also think people have probably been overestimating how much they care about maintaining some perfect balance between options in the roles, otherwise we'd have had a new healer added sooner.

Huh? The flow is...
1.x - 2 Tank | 1 Heal | 2 Melee | 1 P.Ranged | 1 M.Ranged
2.x - 2 Tank | 2 Heal | 3 Melee | 1 P.Ranged | 2 M.Ranged
3.x - 3 Tank | 3 Heal | 3 Melee | 2 P.Ranged | 2 M.Ranged
4.x - 3 Tank | 3 Heal | 4 Melee | 2 P.Ranged | 3 M.Ranged
5.x - 4 Tank | 3 Heal | 4 Melee | 3 P.Ranged | 3 M.Ranged
6.x - 4 Tank | 4 Heal | 5 Melee | 3 P.Ranged | 3 M.Ranged

Given that, it seems like there's kinda a rule that you don't get a new job for a role in the expac directly after that role received one.
It's also not unreasonable to expect that they will keep putting out at least one dps per expac, so the only real earlier point we could have gotten a new healer (without doubling up releases) would have been in 5.0 instead of GUN but that'd just flip things and 6.0 would be the earliest for them to be 4/4 either way.