They can get kicked if they run around pretending to the leader / HO of their current guild they're in. If there's doubt, one can request that the player provides a screenshot of the guild roster, and it all becomes clear.
Personally I like the idea of shortening those guild titles. In fact, I think this was tested for a while, a few months back; I'm not sure why the devs reversed to the old title format.
edit: One issue would be with people that hide guild name from the GUI.
edit 2: The problem of people retaining guild titles even when switching guilds should be addressed separately as a bug. Your current title should be compared against your list of available titles, and since that list is refreshed as soon as you leave the alt guild ...
Personally I like the idea of shortening those guild titles. In fact, I think this was tested for a while, a few months back; I'm not sure why the devs reversed to the old title format.
edit: One issue would be with people that hide guild name from the GUI.
edit 2: The problem of people retaining guild titles even when switching guilds should be addressed separately as a bug. Your current title should be compared against your list of available titles, and since that list is refreshed as soon as you leave the alt guild ...
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