Personally, I'd like to see bonuses to Threat gen - either a passive increase by a few percent overall, or a threat increase to one or two skills by a larger amount, say, 20% - things like sweeping Slash to help with AoE tanking. Another way would be to let threat hit more targets - Saber throw hits the Target for 100% more threat and two additional targets within 5m for 50% threat. Vicious Throw hits an additional 2 targets within 5m of the primary target for 50% threat.
As for survivability though - just reward people for using skills. Backhand bonus called 'Seeing Double' - back hand the target, causing them to see douple for 3 seconds reducing their chance to hit you for the duration by 50% (effectively just increases your defence chance, but gives it more flavour).