Remaining Niches to Fill?

[Darkoon]

LEL

wow has 34 playable classes
swtor has 24 classes
rift has 32 classes

ff14 has 9 soon to be 10

set the bar low much?

I think you are exaggerating and inflating the numbers by counting the skill trees as separate classes.
And to stay on topic, I think Beastmaster could serve a different niche by making them what SMN should have been, more emphasis on the pets rather than the character.