I suppose that's similar to those who only watch the big games in the EPL so don't mind the club channels on sky. I think there will be enough of a market.
The market will tend to be older with a fair bit of disposable income too, so they won't mind (thought it'll initially annoy them as they'll currently have sky) paying $15 a month for it.
The flip side of that is an older audience may not be so willing to try something new like an online service. 54% of votes on stuff said "if its not on tv I'm not watching it" which really highlights this point.