The whole point is for them to leave. They it further solidifies their power, and as far as population growth goes they’re already attacking pro-choice AND education to ensure that they have a steady supply of ignorant and easily controlled constituents.
Unfortunately it won't work like that. When the educated move away or don't move there to begin with, the idiot density increases. The local businesses will have a hard time finding educated labor and will fail or be forced to move, too. The states will become poorer and suffer from that but the idiots who drove away those that could've helped won't see that it was their own doing. They will blame the liberals, foreigners or some other scapegoat to have taken their jobs and with their now decisive majority vote whomever joins in pointing fingers at their chosen "oppressors".
As long as the state stays red, they'll always have equal say in how our government works. That's the plan, it's a slow hostile takeover because representation doesn't correlate to population. It's how Wyoming has the same voting power as California, even though California's GDP is measured on a global scale more accurately than a national scale. The more educated people leave to blue states, the more say red states have in national politics.
Usually, capital flight from political or physical violence causes societal collapse. Yemen, Sudan, and North Korea are all examples of this. Russia got hollowed out when the war began and most young people with talent left to pursue a better life elsewhere.
You end up with people that either fomented the problem, or anyone else that can't leave. And it's rare to have people move back or reinvest in the region, which is risky. States have a lot to lose when you do stuff like ban abortion or queer people. People won't move their families if there is risk of them getting hurt or sick.