The Lucas idea that crime bosses fill the power vacuum left by the empire is a really good one. I could take or leave everything else, but that would at least be a unique enemy that isn’t just more of the empire (though some stories with the imperial remnant are cool too,) and it makes a lot of logical sense.
I think some of that bled into The Mandalorian, at least in season 1. It starts with all frontier bounty hunting stuff because this is the aftermath of the empire’s defeat, though fragments of it are still there.
Some of Lucas’ crime-boss trilogy ideas definitely seem to have bled into other Star Wars media. Like Darth Maul actually appears as a crime boss in a cameo at the end of the Han Solo movie. In fact, the Han Solo movie seemed like it was building up to depict a world of criminal organizations vying for power.
But then again, I don’t think Lucas’ “crime boss trilogy” idea appeared on the Internet publicly until very recently (maybe like 2021?), which makes me wonder if the crime boss trilogy was ever real, or just extrapolated from other material after the fact. It’s also totally unclear how the microverse/midichlorian stuff fits in - was that a completely different idea for a sequel trilogy that George pitched at some point, or is it a subplot of the crime boss thing? Who knows.