As someone who regularly uses them I would be very sad if they were banned. It is a very convienient mode of transport and can often cut journey times in half for me compared to public transport. I also ride a bike but I don't always have it with me, or want to lock up my bike somewhere overnight and risk having it stolen.
I think it would be unfair to punish responsable users because of a few bad apples. Half of the people leaving them in the sidewalk aren't even the users themselves, but frustrated vigilantes who see them as a symbol of capitalism gone wrong and who want to vandalise them.
Maybe some actual enforcement of cycling rules is needed, but outright banning is draconian and unnecesarry.