Who choose how to merge Servers?
Why you keep a whole Server and the merged ones are lost?
In my Opinion it would be best to keep the Territory with the most progress of the merged Servers.
Like some contest to get the greatest City to keep it.
Also there should be no payback for the Guilds.
If you go on like now, a Powerfull Faction tries to get all territories to earn as much Money as they can from the merge. So territories will downgrade cause this guilds dont care about them. They jsut want profit.