Most people don't think they'll pay that much. They take today's offerings, i.e. AT120 for $40/mo and do the math ... $.33 per channel or AT200 for $55/mo ... $.27 per channel.
The way it works today is any channel in AT120, for example, has millions of potential viewers. They negotiate their rates based on potential viewers too, not actual ones. If a la carte existed, the provider will tell the network "x customers subscribed to your channel this month" and pay them accordingly. Rest assured, channel's profits will change dramatically !