It will be a great idea because everyone watches tv this way you can reach everyone with the idea of bitcoin and the popularity will increase very fast if you keep advertising it on TV you can also reach a lot of groups this way old people, young people, teenagers and even investors.
You really can't say that this is a great idea. It actually happens in my country recently in which bitcoin was being recognized on a different point of view(i can't say either that it was just an opinion cause they have proofs). They recognized bitcoin as the medium of all transactions in the black market which is i think not good on our end