Assuming a tank nerf happens, and my agency to help my party as a tank is completely taken away in the context of a bad or suboptimal healer. I can pretty much guarantee that I'll never queue for duties again outside of MSQ patches.
There are far better ways to cap weekly tomes (see hunt trains).

Having your ability to clear content be gated by the competency of a single roles is unfair, this is megalomania, I'm sure most of you are aware that tanks aren't needed either in casual(normal) content. Expert roulette can be cleared with two (or even one) healer easily, modern alliance raids too (you can survive a tankbuster in Euphrosyne with literally just divine benison and aquaveil + food @660ivl), Healer only ARs have been cycled through in Dynamis DC partyfinder.

I understand the overly simplified DPS rotation being a problem, but this intense desire to have other roles completely rely on you to survive in normal content even when they never get hit and press their survival buttons very well, comes across as gross and clearly overstepping behaviour. Players of non-healer roles deserve some sense of agency over their game play, especially when personal agency is so lacking in day to day life.

Please make this about your experiences only and don't step on other roles.