TV is a box capable of transmitting various channels. I do not understand how you can get one definite universal answer from a Rav about it.
Is one allowed to watch financial news if he is a financial analyst? I presume yes.
Are there shows that one is not allowed to watch? I did not watch them lately, but I presume that there are still some.
Is one capable to keep to the allowed channels? depends on a person and on a family.
Is it a good public policy for the community? this is a question for a Rav
Is one allowed to pay $100 for the cable TV if he can access the same information via already paid internet? Definitely no, switch cable off and send $100 to tzedokah.