People have been dropping tank stance as much as possible since coil. We were sword oath tanking stuff regularly since second coil, cheesing tank busters with immunity forever. One could argue the only reason we didn't use it to the extreme in the early days was both avg skill level was lower (1st coil was much harder because the game was new, people still thought parry was good, etc. Just being bad at the game) and shirk/ninja didn't exist.
Shirk+Nin is the single thing that has done the most to reduce tank stance uptime. Even Drk who has zero enmity actions beyond their combo can pull and tank an entire fight without using power slash or grit once. If you really just HAVE to make people use more tank stance, make enmity a thing. Mitigation never really has except when we were new and sucked. Ninja+shirk, 30 sec recast on enmity jumps, etc have all reduced the need for tank stance.
But every time enmity is an actual task, tanks whine to high heaven about how hard it is to tank and the forums explode like the early days of SB, or a number of other weak enmity phases in the games history, and SE buffs the shit out of enmity again for the 20th time.
People don't actually want tanking to be a balancing act. They want it to be EZPZGG. As long as enmity is minimized, so will tank stance. So where are the threads to revive butchers and halone? They are tank skills that aren't used to tank just like stance, but at least stances have some potential to vary gameplay, express coordination and act as a safety net. Stances as a tool are less used than they used to be, but that still doesn't make them broken anymore than butchers block.