Wonder what OoW would have been like if GoD and OoW had been one big expansion as intended. "Realms of Discord" would have been a good name for it.
Going off of the way GoD is set up, chances are OoW would have been a similar system of gated zones. The portal to Discord would have either been in Qvic (where they initially ported into our world IIRC) or Tacvi, beyond Tunat. Tacvi might have even been a bit later in the expansion, beyond the first couple OoW zones, or maybe it wouldn't have existed at all and was added as the GoD endzone after they decided to split it.
Much like Barindu, Kod'taz, and Qvic are kinda hub zones, Dranik's Scar would have probably been the next one after the Qvic/Inktuta/Txevu zone set. Then you've got the Sewer trial zones in DS that likely would have needed to be done to unlock the next set (like the Sewer trials in Barindu originally needed to be done along with Tipt and Vxed to unlock the next tier, early in development, IIRC).
The DS sewer trials always seemed like they were intended to be for something more important than just signet mobs being stashed in them. So after the DS sewer trials you unlock Harbinger's Spire, Bloodfields, Causeway, RCoD and have to do something in those to unlock WoS, with WoS being the next hub zone where you gotta do trials or raids in MPG, Tacvi, and RSS, which unlocks COA. Obviously some of these zones wouldn't have existed in this hypothetical (Tacvi and RSS strike me as the most likely to have been late additions to their respective expansions).
I don't know, something along those lines seems pretty likely for this hypothetical super-expansion. It would have been a similar size to PoP, perhaps a bit bigger, and had a vaguely similar flagging system with tiers. It was also supposed to have raised the level cap from 65 to 70, so you'd have that from the get-go. Instead we got half of it with no level raise and it roflstomped people into switching games.