So about current state of Fordola and Arevald in 5.0...
Playing through the lvl 80 Summoner quest we learn that Fordola and Arevald are now part of a Anti-Primal Squad. They are always fighting together to defeat the primals being summoned in Eorzea while we are doing other stuff.
Considering how the quest treat them, I can assume Fordola and Arevald are now considered members of the SMN Job NPCs so if Role Quests in the future begins to use all Job NPCs in a storyline we may expect Fordola and Arevald's story to be continued in future Role/Job Quests involving SMN Job similar to how SMN lvl 80 quest continued their storyline in 5.0.