So now with all the discussion about fixing guild renown, that would certainly result in some guilds increasing in size. I would love if it would be possible, well even mandatory really that every member (account, not character) had to designate a MAIN character, and that all ALTS of said main would be marked as alts of that main.
Sadly there is some people, rare thankfully, that enjoy to make other people miserable or in other ways disrupt the good times of others, and would be nice as a leader/officer to make sure every characters of those person could be removed from guild.