Guess the Expansion: After Shadowbringers Contest

[Seraphor]

Another gun dps job is about as likely as another bow dps job.

The parallel drawn with 'swords' is always a weak one, because that's more or less a quirk of the english language.
Ultimately a katana is not just 'a sword', it's a katana. Even a rapier is not just 'a sword'.
Swords are so varied they have their own classifications, which are typically double-handed, shortswords, thrusting (edge-less) swords, single-edge swords, and then various outliers with different regional classifications such as katana.

They are all bladed weapons, just as a gun and a bow are both projectile weapons. This is where the classification is focused, and why we're not likely to get another gun wielding dps job. You simply wouldn't be able to differentiate weapon models enough to justify it being reused for another job. MCH already claims many different types of gun model, including pistols, shotguns and rifles. Similar to how Paladin has various forms of shortsword; longswords, scimitars, spatha, etc.

Plus, what would this new gun job do that MCH doesn't? Fire more bullets?

The only hope I see for another gun job, is in a different role. Tanks already fill this niche via Gunbreaker, so it would have to be a Healer, Chemist perhaps.

[Kesey]

Another gun dps job is about as likely as another bow dps job.

If the Ranger class is ever added, I would assume as a physical range, it could just use a crossbow. But I guess it is just as likely to use blow darts or a boomerang.