Currently playing Final Fantasy XIV. All melee classes overlap far too much mechanically but are thematically interesting.
My opinions: 5.0 was the golden age of content, the ability prune barely did anything, and 6.2 is actually an enjoyable timesink.
I am not touching the PvP realm issue but multi-character transfers are another topic altogether. It doesn't seem like an unreasonable suggestion for the players to be able to transfer a notable number of characters at once for a somewhat discounted price.
There are risks with the biggest ones being tied to individual realm economies but as long as the service is designed appropriately with smart limitations then I think the pros outweight the cons.