That's fundamentally the problem; these guys don't really want to build a living breathing vibrant and holistic city, they want to build a giant luxury lifeboat that could, ideally, fly. Left to actually execute with the technology that exists what they inevitably construct is a giant tumor that just sucks the life out of the surroundings. If they could make it nuclear powered and able to literally condense drinking water from the air so they genuinely didn't have to transact with society at all you better believe they'd do exactly that.
Ironically enough, if they genuinely could make their little city fly into space probably the best thing we could all do is hurry them along. There won't be a shortage of well-motivated smart people left behind. They'll just be the nice ones.
The funny thing about these people is that they're so out of touch and detached that you could literally meme them into naming it Galt's Gulch and they would absolutely do it thinking how cleverly ironic it was, while just not getting it at all.