I don't think follow bots are a good idea, because they make the federated timeline the same on every node. Without them, the federated timeline is still an expression of the interests of the node's users.
@lambadalambda that's an interesting point. However, instances that are not running follow bots will not have this issue. So in the end it's up to the instance admin, if they want to make it easier for users to find other potentially interesting users (by running follow bots), or do they prefer to keep the federated timeline a better reflection of local users' interests. :)