Few of them are either set up or outright wealthy enough (now) to live without the blue cities, and the few who are will find that living off the grid isn't as easy as they think it is after a rather short while.
Economic infrastructure comes from the coastal blue cities. Transportation infrastructure is supported by the more inland blue cities that act as hubs.
Will most MAGA be able to handle extended time delays and uncertainty in deliveries of basic supplies - like gasoline, manufactured goods, groceries - to their more suburban or rural communities? Will they be able to handle intermittent or outright loss of communication, banking, electricity and water infrastructure?
With a very few exceptions, even most "hardcore" militia and Prepper types depend on outside infrastructure for their communications and resources replenishment, all of which is based in the economic wellbeing of their state cities.

Hint: most "Mountain Men/Rugged Cowboys" or their frontier families did not live in subsistence isolation all their lives; they would regularly head down into town and get the supplies they couldn't make or store enough of; even remote, isolated communities had trade with other communities whose own trading extended on to cities. Once a family or community became settled in the frontier, they had to supplement what they couldn't do for themselves somehow, and looking towards production hubs that turned into towns and cities was always the difference between long-term survival and just lasting a season or two before giving up and moving on because they used up all their available non-perishable stores and their tools wore out.

Haele