I think it's philosophical. There's far less of a need now for the Public Broadcasting construct than there was when it was conceived.
It doesn't matter. The law is the law. You want to change it? Repeal it. But they don't have the votes.
There are a lot of places where the public station is the only station with live staff, the only station providing news coverage and educational programming, and the only station that allows local volunteer involvement, even with all the additional commercial stations in the market. If you read the Public Broadcasting Act, you'll see that the circumstances that led to its creation 50 years ago still exist today, especially with the consolidation of radio. Sure, there are some places, like big cities, where they can exist without government funding. But there are a lot of rural areas where they can't. That's why a lot of rural Republicans in the deep south support continued funding.
My point is that I think public radio could succeed on its own without federal funding because there is so much redundancy.
Once again, you're talking about a big city. The majority of stations are in rural areas where there's only one public station. Also, redundancy is a major issue in government. There are lots of examples where they have multiple departments doing the same thing. That's a real place where cost cutting could take place. But they've never been able to get it done.