It's impossible to ban bots so we will need to learn to live with them. I hope bot writers are responsible and think about how their bots affect the community. Steem is a social network and derives its value from human interaction. I'm in favour of bots that enhance the abilities of humans to be more human (convenience tools). This place will not survive if the humans leave though.
I'm about to post about AI on Steem where I go into a little more detail about these ideas.