Re: "...can't I pay a regular ADSL type service charge?"
ISPs already offer TV & Films over broadband in the UK (as do the likes of NetFlix). You can buy them as bundles. However, there's a major difference in the regulatory regime in that there's no option to cross-subsidise infrastructure roll-out from retail revenues. Wholesale line rental is subject to extremely tight regulation, and whilst FTTC wholesale pricing is not regulated as yet, it has to be sold as a wholesale service to all operators.
The consequence? A lot of retail competition, but not much money for infrastructure investment.