I'm sure they could do a sort-of-manual process where a guild leader could get a coupon for a new guild and X guild renown, but "copy and paste to the Universal Server" is a lot harder than it sounds like.
Character transfers aren't horribly painful most of the time, but when anything goes wrong, there are going to be some really angry customers and not nearly enough customer service resources available to fix the problems that come up.
I absolutely agree that something is needed, but I'm not confident that SSG can manage to pull it off.