That’s about it.
I doubt this…
But if they’re thinking out of the box the big technical hurdle for mega servers would be analyzing all your people connections and trying to keep the same friends and guild networks on the same shards so you do see the same people day after day. And then add some process like disk defragging to slowly and transparently move people around to keep them with their current and emerging friend networks.
If all the new layer/realms are always squished to full, and you continually see a lot of the same people, cross layer/realm find people tools wont be needed as much and some of that community feeling might come back.
But I think the cost savings of mega servers would need to be greater than the profits from server transfers before they would invest in that.