When they lose the moral/philosophical argument (against 'government', 'authority' and the State), statists love to fall back on "What's the alternative?" Then they expect Anarchists to describe how every aspect of everyone's lives, until the end of time, will all work perfectly without a ruling class. But statists are so comfortable with the authoritarian mindset that it takes a while for them to even comprehend what is being suggested.
The belief in "government" is the belief that some people should have an EXEMPTION from morality and should have the RIGHT to forcibly rob and dominate everyone else. The answer to such a horrendously bad idea is very simple: the "alternative" to imagining that some people have the right to be violent bastards is......... NOT imagining that some people have the right to be violent bastards. Nothing else needs to change. We still have all the technology, all the resources, all the cooperation and organization. The only thing we lose is a gang of parasitical crooks getting societal permission to victimize everyone else. Now, if some statist wants to point me to any problem which is IMPROVED by giving some people permission to violently victimize innocents, I'd love to hear it. Otherwise, the whole "What's the alternative?" thing is as silly as saying, "But if we get rid of car-jackers, what will we have instead?"