I think the Night Elves and Worgen should retake Gilneas together and make that their new home. It would go full circle of the Night Elves taking them in. Plus it would cement that the Eastern Kingdoms is the Alliance's now and Kalimdor is the Horde's, mostly.
I understand they would take issue with moving but even so, the Night Elves deserve their own home at least until they fully retake it as right now they're resting in Stormwind on the Eastern Kingdoms. If anything I would only see it temporary much like the Gilneans themselves.