I think we may see a phenomenon along the lines of the downfall of WoW. Just one thing that happens in WoW is that people stand in damage for more damage uptime because they know it wont kill them. This will bring about toxicity in game.
I also notice more toxicity in game in boring easy content like ST and Laby. When people are bored they seem to find ways to entertain themselves that arent healthy for the game.
I think with continued easy game content, the politeness of the ffxiv community to play the game as intended and move out of aoes will decline into people just standing in any aoes they can so they can keep attacking. Especially with massive room wide aoes we saw in the media tour dungeon.
If you do the aoes, you dont need a healer. So if you have a healer then you might as well stand in as much aoe as possible to do more damage to compensate for not running a third dps.
Maybe it would be good for the game though. It would give healers something to do and using the myriad ogcds to heal wont drop dps anyway. Even if a healer is pressed into healing with gcds too from a new meta of standing in aoe to deal more damage, i think the dps keeping uptime will outweigh the healer gcd healing instead of attacking anyway.
These things even get to a point where people will tell new players to not bother moving out of aoes because theyll just lose damage and make the content take longer for everyone. Then soon enough it will be considered toxic to move out of aoes.
This already is the way in other games. Dont think it cant happen here.