Bitcointalk's indifference towards alt coins only changes to disdain when it interferes with Bitcoin discussion, which is why it was given its own section. Removing the Alt Section would just lead to people posting about alt coins in Bitcoin related boards, which would be even more annoying.
Which is also why lots of subforums we don't necessarily want, are required. Trying to stop the bath running by closing the bathroom door does not work, its simply going to floor the rest of your house.