They would just rework Tenacity in general before they change things back to VIT.

People dont choose tenacity because our gear and defensive cooldowns along with shields and utility from other jobs makeup and exceed the defensive side for tenacity, while at the same time DH, DET, CRIT, and obviously STR increase our damage way more than Tenacity does.

The classic MMO saying " The boss cant hurt you if its dead" promotes more dps

Tanks need rebalancing and I am sure the devs have spent so much time in terms of 5.0 balancing that our conversations here have nothing to do with the new systems they have in place in 5.0 along with TP/MP combination.