Well, off the bat I'm not sure that I agree that anarcho-capitalism means there won't be governments.

I see sovereignty and anarchy as being a descriptor of your relationship with authority. If you don't have to cede to an authority and other authorities are effectively your peers, you are sovereign.

As such, consider the fact that nation states are sovereign. At this level, nation states operate in a state of anarchy - they don't HAVE to cede autonomy to other bodies.

So when I talk about sovereignty maximalism I mean more that individuals can achieve similar levels of autonomy as nation states, not necessarily that nation states will disappear.

This is already occurring, though the bar is still quite high - you basically need to be a billionaire.