This will never be a thing as people have already said. This would absolutely not work in pve at all. The nerfs to healing currently on the PTS are already seemingly making much content either incredibly difficult or straight up impossible. 1 instance of each HoT on each player is also no where near what is available right now. Not even half... Not even a quarter probably. The only way this would work is if all of these mentioned heals were buffed in numbers significantly, that in turn would then make 1v1 pvp and small scale pvp unplayable as no one would die... so basically there is no way it would work out.

The other issue with it is that believe it or not, the majority of casual and zerg players survivability comes from cross healing from other casual and zerg players. This would make sieging keeps super hard and it would most likely fail consistently against some counter siege. There is just no way. The game isn't designed for something like that. Healing is definitely op, though I think that the nerfs on the PTS right now are certainly overkill and will most likely be adjusted before live... hopefully.