If we try to advertise on TV definitely the government would know about bitcoin and start pointing taxes on it.
This is what Im thining if bitcoin will advertise on the TV. The question is who will behind this thing. Maybe if there is company that run a business and their using bitcoin would this be fine. And, this is a big help to attracts more user into bitcoin. But before doing so, bitcoin should resolved the issues like delayed receiving of btc and etc.