Just trying to be practical, nothing wrong with WotG per se, but it'd still take development time to port over, and losing it would be minimal, aside from the mission story arc, and the needed adjustments to the DNC and SCH job quests, so that they don't involve the past zones to complete. and adding Fort Karugo-Narugo, Grauberg and Vunkerl Inlet to their respective present zones. (Then again I just realized I didn't take into account that Walk of Echos is strictly a past zone event, and is used to upgrade Empyrean weapons, so there's that, but you could work around that with the other confluxes in Present Vana'Diel)
WotG is my 2nd favorite Mission Story Arc behind Chains of Promathia.
