Intuitive Tanking.

[saeedaisspecial]

So your idea is just a simple forced tank swap.
Pretty boring considering this is already one of the most boring mechanics in fights for tanks anyway.
Instead of "Oh I'm at three stacks provoke" It'll be "Oh I'm low fatigue, provoke"
Genius.

[Mjytresz]

So your idea is just a simple forced tank swap.
Pretty boring considering this is already one of the most boring mechanics in fights for tanks anyway.
Instead of "Oh I'm at three stacks provoke" It'll be "Oh I'm low fatigue, provoke"
Genius.

Pretty much this. From experience, forcing meta and mechanics are a bad thing.

There was another game I played where tank-swapping was the only way to get through boss fights, either due to insta-kill mechanics or DoTs.
Aside from that, dual-tanks was never really desired or necessary. The equipment in this game is ramping up in a way that's going to promote soloing/duoing soon.