I think the objections put forth by left-anarchists still apply. Right-libertarians will have a hard time justifying specifically capitalistic property arrangements over usufruct within any NAP framework.

Also, I don't think this NAP argument really works against government action either. See my series on ethics: https://steemit.com/ethics/@ekklesiagora/ethics-3-part-series-summary-anthology
Given such a framework for ethics, which appears to be the only reasonable one, it would be possible to reach a different conclusion. If, for instance, humans would be generally happier and suffer less in a social democratic society than in a fully libertarian society, the former would be preferable to the latter.