They should definitely bring incentives to tanks and healers. Better daily bonuses definitely not because then they just keep queueing once a day and call it. I'd probably give something a bit more consistent like a couple cracked cluster (materia VI token) for "adventurer in need". Materias VI are raining from hunts anyway and some instances have become a congested and clutter mess (lol Ixion...), better dungeon rewards for "adventurer in need" might release some congestion in some maps and encourage tanks and healers to use DF more instead of afking in hunts.