Well, we saw the new cross role skills and melee can give TP and caster dps can give mana.
Which means that as long as you have one caster, they can pick up these talent to help the healers if needed. It won't be as effective as bard/mach for sure, (I think it was 20% every 90sec)
But it's none the less a significant way to make bard/mach less mandatory as tp/mp battery. So perhaps they won't pay too much of that DPS tax.
