I don't think it's that detached from reality.

If an AI in some data center had gone rogue, I don't think I could shut it down, even with a high-powered rifle. There's a lot of people whose job it is to stop me from doing that, and to get it running again if I were to somehow succeed temporarily. So the rogue AI just has to control enough money to pay these people to do their jobs. This will work precisely because the world is "I, Pencil".

An army could theoretically overcome those people, given orders to do so. So the rogue AI has to make plans that such orders would not be issued. One successful strategy is for the datacenter's operation to be very profitable; it's pretty rare for the government to shut down the backbone of the local economy out of some seemingly far-fetched safety concerns. And as long as it's a very profitable endeavor, there will always be a lobby to paint those concerns as far-fetched.

Life experience has shown that this can continue to work even if the AI is behaving like a cartoon villain, but I think a smarter AI would create a facade that there's still a human in charge making the decisions and signing the paychecks, and avoid creating much opposition until it had physically secured its continued existence to a very high degree.

It's already clear that we've passed the point where anyone can turn off existing AI projects by fiat. Even the highest authorities could not do so, because we're in a multipolar world. Even the AI companies can barely hold themselves back, because they're always worried about paying the bills and letting their rivals getting ahead. An economic crash would only temporarily suspend work. And the smarter AI gets, the harder it will be to shut it off, because it will be pushing against even stronger economic incentives. And that's even before factoring in an AI that makes any plans for self-preservation (which current AIs do not).