I think the small guilds(like 5 members) should come together,but let's not destroy the big ones,there can be like 2 rival merchant guilds and they could like hire thieves or whatever to sabotage the other ones caravans and kill their traders.And also,half of those guilds ranks are:Soldier,Corporal,Captain...They could at least come up with a different name or rather use some words which aren't used anymore.