There is a big difference when it comes to trying that approach with conservative talk show hosts. It actually takes some talent and education to keep that position viable. Drop a stooge into the slot and the audience goes away. See Air America for an example.
“See GM for an example.”
Here’s the difference: talk radio is profitable. Just like with vampires, the government couldn’t suck GM’s blood before GM invited them in. Unlike with car companies, the government already has a standing invitation to invade communications outlets called the FCC. So they’ll bust in, but it won’t be like it was with GM.