1. and 2. There are not situations like that maybe only on Balton it could looks like that if he won't be killed in 20s - 30s. Still Druid could heal everyone because of amount of HoTs. If HoTs can heal all dpss or keeping them alive to reset your Fountain cd you can focus your Recover on tank and everything will be ok. GH still doesn't make Priest flexibility because in situations you talking about Priest can choose Scout or Druid for subclass and then Priest still doesn't have to help his Druid by GH, Curing Shot or Healing Void will be enough and there is no point to use GH.
3. Again about positioning... maybe they nerfed stamina healers to avoid making offtank healers or just tanky healers and that's why they give healers like wl/d 200 range on AoE heal to stay far away from mobs, anyway you can stay in mobs on that class using Whisper and Mind Barrier. This is the point why GH should be adjusted to Chronicles of Arcadia, it's no longer Runes of Magic where you could keep everything on full stamina Priests. They should nerf profits from giving healers stamina even more and make full wisdom healers as a requirement to heal. Healing Void - 100 range but you can run away after casting that spell, Chain of Life - range 200 from healing, Regenerate - range 200 so it seems like they don't want healers to come close to mobs in any situation, healer should stay away from them. It simple to go tanky healer and stay wherever you want but it probably isn't something what developers want to achieve. I think they want healers to be more carefully in CoA than in RoM.
4. Of course you can't see hard situations when your dpss kill mobs instantly. We often take dpss with low equipment and then mobs before and after 3rd boss put really strong dots on most of our players. It is just the hard situation when Druid can heal it solo easily and Priest not. I see you want to make Druids only AoE healers and Priest single target healers. Maybe they should remove single target healing skills from Druid and AoE healing skills from Priest/S/D to make great balance for you. I don't think it would be bad but giving new healing classes with good AoE healing skills doesn't mean team want the same.
5. HoTs and Fountain on raid and Recover on tank additionally. It's simple for Druid but not for Priest. You started talking about situations that won't happen at this moment and it's not seems to be in the nearest future. Even in this situation i prefer GH from my idea to using Fountain and GH on turns with Druid.
6. Of course it's easier and better to adjust all healing classes to be similarly strong in every situations but in other mechanics. Druid has slow cast but he has HoTs and Priest has fast cast. At this moment Druid has slow cast, HoTs and great AoE healing skill and Priest has only his fast cast and no good AoE healing skills. Spamming GH isn't flexible it's quite unskilled than using it in right time every 4 seconds on turns with Druid like i said.
No, the team shouldn't focus only on dps because they started to make druid more as dps and less as a healer. There is enough dps combinations to work on and if they nerf something they nerf it too much and that's why they work on it so long. Small steps are better in this part of class balance. Please stop joking, they changed most elite skills to revive R/S but they couldn't change one skill on Priest to make him as good as Druid is? I hope they will change GH because it would make other Priest's combinations more viable.
Thamks!