Is this the future for the rest of ARR's upcoming expansions and updates?

[Baxter]

Fine, here is my rebuttal for FFXIV: ARR is only add dungeons runs
Patch 2.1 will include the following:
Housing - Non Dungeon
PvP - Non Dungeon
Treasure Hunting - Non Dungeon
Beastmen Dailies - Non Dungeon
Extreme Primal - HNM, Not Dungeon
New Primal - HNM, Not Dungeon
Crystal Towers - Dungeon
HM Dungeon - Dungeon
New Dungeon - Dungeon

when people say dungeons they likely mean "instanced" content. You can go as literal as you want with the terminology but an instanced boss battle accessible via duty finder is not overworld content, which the OP explicitly mentions. Your rebuttal falls short because half of what you mentioned is either not end gaming content and the things that were are in fact instanced/non overworld content.