It seems to me that if SLS goes… so does Gateway. That said, one thing to note: There are not that many stable lunar orbits. Unlike the earth, the moon is very lumpy. It is the reason why most lunar orbiters end up doing a planned crash as their end of (relatively) short life. From that standpoint, orbits that are a bit further out are much more appealing to have relatively low delta v requirements.
All that said, once Starship is regularly in use for lunar delivery… I suspect we will have a fundamental new paradigm for space.
All that said, once Starship is regularly in use for lunar delivery… I suspect we will have a fundamental new paradigm for space.