If we wanted another class thrown in, would make more sense to consider a baseline fact with a baseline demand. First off, a lot of players diversify so that you find an assortment of all class variants. Secondly, half of the base classes target DPS, and the two non-DPS base classes easily can go DPS. With that in mind, it would make sense that, if there was a new class, that instead we had more variants of healing and tanking instead.
Maybe like a spell-sword tank, that does basic melee damage based on INT, but has an entire rank lineup focused on “ways to tank”, and absolutely no access to two-handed weapons. Take that, then add a new way to heal, something pure about healing and not a “Red Mage” like we’ve got right now for Cleric… maybe even not a holy-healer either, but instead one that builds its concept of healing around more traditional elements, such as Water healing (Ice), Nature healing (Earth), Chemical restoratives (Poison), or High-Tech (Lightning), which they have while wielding a weapon with no capacity of physical damage (And possibly instead have a lot of supportive skills, because at this point, if you exclude their ability to heal, MAGES have more support options than Clerics. Buffs and Healing in one please.)
This is probably a lot more meaningful than even more physical melee dps options.