They said they have content for 10 more years, which means Dawntrail and four more expansions. If we follow the rules they've been doing since Stormblood, which are 2 jobs per expansion and no jobs from the same role and armor set in two consecutive expansions, we get to something like this:

- Fending and Aiming
- Striking and Healing
- Maiming and Casting
- Scouting and Aiming

That means that in the end will have 5 Tanks, 5 Healers, 9 Melee Dps, 5 Physical Ranged Dps and 5 Magical Ranged Dps (and probably one more limited job). Of course, they can still expand the game from this point on, and I belive they can at least make the fives be sixes, but for now this is what is almost certain to happen. So what are your bets and hopes for the next jobs? Here are mine:

Fending: Mystic Knight with a scimitar
Maiming: A job with two axes
Striking: A job with a quarterstaff
Scouting: Corsair with sword and pistol
Aiming 1: Puppetmaster. The mammet will be the weapon.
Aiming 2: Blitzballer
Casting: Geomancer with two bells
Healing: No idea. Maybe Chemist?
Limited: Gambler with throwing darts