I don't know if many people disagree, I can't speak for "many people"
Maybe it is not a popular view now though, but that doesn't mean it that it can't be the popular view (or principled stance, as I like to call it) of the future, once more people have come into contact with voluntaryism and given it some thought.
I totally agree with his view that all human interactions should be consensual and voluntary, when a few years back I would not have had that view, mostly because I didn't even know of the existence of such a view.