This isn’t the first time someone thought of this. About 20 years back, we had something called Air America. it was basically a progressive radio station had a lot of goat talent on it. The morning show was A+. They had Liz Winstead who created the daily show, Rachel Maddow before she started her fake geek girl thing for TV, and Chuck D from Public Enemy. Then they had Al Franken, which was pretty good, but he was kind of an a$$hole. Randy Rhodes was her afternoon host and she did great too. Then Thom Hartman was on it as well at around noon.
The problem was it was kind of a the producers style scam. It was intentionally set up to fail, and you could tell the leadership started to sabotage it to send it under. not paying talent except Al Franken, then when people started leaving, they were replaced them with terrible talent who I think were intended to tank the company. Producers ran off with the investment dollars and it finally ended. A lot of the talent went on to have success elsewhere.
It would work someone just has to pony up the money to create a channel. The problem is nowadays anyone with talent is going to form their own podcast and be their own boss. We need liberal talk though. The closest thing we have is NPR, but it’s overrun with pro Israel Zionists.