To prevent WvW exploitation and snowball effects of wining/losing servers, I think it could be greatly avoided if there is a scheduled world transfer.
Example:
Have world transfers granted right before the WvW reset on Friday. You will have to opt for world transfer right before the reset, and if you miss it, you will have to wait until next weeks reset to transfer.
Reason:
This allows you to join with friends/guilds still and prevents you from transferring only to exploit a WvW match-up since you have no idea what the pair ups are when you transfer, and when you do know, it will be too late to transfer.
Please give suggestions/opinions on the matter.