The entire Healing Role has been in an existential crisis for four years now, two expansions.
You say people are actively not playing Paladins? LOL. People legitimately aren't bringing healers to runs at all. Single healer EX is relatively common.
WHM was actively avoided for multiple expansions.
But like we said in our Double Standard post on the healing forums, Hydaelyn forbid a tank have an issue, because then it gets fixed really quick (With the exception of the Bastard Child Dark Knight and Living Dead).