Well come Heavensward the bots are going to be largely screwed since they will need to complete the story to access any of the expansion areas and content. That means the bots will have a hard time farming anything in 3.0 and if they get banned they have to play through all that story content again on a new account.

It won't directly impede their /tell spam but it should severely harm their productivity which might scare them off a bit.