Would you be ok with no new tank or healer in 5.0?

[Reynhart]

I would love to see tank who do damage by reflecting and mitigating

I'd say you don't necessarily need a new tank for this. You just need to change Grit to Dread Spikes (A skill that reflects back and leech a portion of damage taken, which existed in FFXI DRK), to have a new kind of tank and give DRK more identity at the same time.

If they plan that kind of changes to make (at least) tanks more unique, I'd be okay with no new tank.