The above facts are conservative existence proofs that an ILRP is technically feasible and that there is sufficient interest outside of governments in the Moon.
The ILRP can begin with the first teleoperated robot on the Lunar surface.
Given this evidence, a permanent settlement on the Moon is likely to occur. It is just a matter of when and by whom ...
NASA has conducted four separate analyses of strategies for how to extend human presence beyond Low Earth Orbit since 1989. The 90 Day Study of Human Exploration of the Moon and Mars; the Decadal Study for Exploration; the Space Architect Team which led to the Vision for Space Exploration; the ESAS team; and others. Most of these reports can be downloaded here and elements of these reports formed the basis of concepts for the International Lunar Research Park.