When you think about it, why should we have to pay extra in the first place? The government mandated the change to digital transmission, so these channels will be transmitting in HD anyhow. (Don't waste space arguing how they don't have to transmit a HD signal, just a digital one. Eventually they will all be HD regardless). So when everything is HD, whats different (besides HD) from when they were analog or just OTA? I can see paying for the premium packages, we've always done that. It's still the same channels, just broadcast in a different frequency spectrum.
The goverment only mandated that OTA signals go digital not the rest of them.