Will WHM be getting a new trait to replace ProShell?

[VanilleFang]

The worst part is that players who turn up their noses at Coil would never notice the issue since accuracy requirements outside of end game tend to be very low.

I don't do Coil myself but I understand some of the issues people have in it. I don't "turn my nose up" at it, I just have personal reasons for not doing it. But yeah, I understand what you mean.

I'm betting on the spell being auto-hit

I could see that. Since they are trying to address issues with the game, that'd be a good place to help healers in end-game content.