Even if you managed to reach a point where you start losing TP, most fights don't last long enough that you'd run out.
Only in the 24 man raids you could probably have something with enough health, and not have an enrage.
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I imagine a "stamina" system akin to dark souls where all actions will cost a certain amount of stamina Quick successive actions, i.e Overpower spam, will cause you bottom out but even and controlled bursts will essentially make the transition seamless. It makes the most sense to me at least and lots of games do it now and it would have the least impact on current gameplay since most good players never bottom out of TP/MP.
They also announced that they will rework skills for all classes to accommodate the new 80's skills and reduce button bloat, so we can assume that a few skills will be merged or land on the chopping block. If they change AOE skill to MP one would hope that they will normalize the costs more around the classes, SAM AOEs are insanely expensive.
And (DA) DRK (DA) really (DA) needs (DA) a (DA) rework ...
I think the amouths of MP physical classes have will be similair to now. Maybe +1000 for lost TP. And the base combinations (single target attacks) costing nothing.
Should have turned TP into something that is built by attacking and then spent through other bigger attacks, seeing as that's pretty much what half the job gauges are.
Limiting aoe for physical dps always felt clunky and not fun. Ultimately its better to simply reduce potencies (if your goal is to keep them worse at aoe than magic classes) than to have the current unfun system where you may bottom out on TP and be unable to act for several GCD's. For single target TP is a largely vestigial resource that was always in conflict with the dev's attempts to make Skill Speed more desirable as a stat.
The idea is that DRK isn't very good currently, so any rework must be an improvement.
However, DRK isn't as bad as people think. It could do with a rework of Living Dead, and some ergonomic redesigns around Blood Price/Weapon and Grit/Darkside, but besides that, it's all good.
Even Dark Arts isn't that bad anymore. It's pretty simple how it grants a flat 140 potency besides AoEs, so you don't need to use it with everything and it's pretty simple to decide what to use it on based on that skills additional effect.
Single target: C&S (max DPS) > Souleater (for HP) > Syphon Strike (MP neutral 140 potency boost)
AoE: Quietus and Abyssal Drain spam on proc between SE combos.
But if TP is reworked in a way some people have suggested, that weaponskills will have no cost and only AoE attacks will cost MP, then actually, DRK doesn't lose anything, because all of DRK's AoE attacks already cost either MP or Blackblood.