> They have a monopoly on a dying service

Neither the access nor the bundled content portions are really dying. The assumption they must be bought from the same vendor is, but outside of very high speed plans, internet access tends to have data caps (sometimes capped unless you buy a TV bundle from the ISP as well as internet service), and OTT services with comparable content are just as expensive as cable plans (and mostly from cable/satellite vendors, though Google and Sony have services too), so you end up spending the same money plus eating your data cap if you buy separately instead of getting the content outside of your cap (or maybe even getting the content and getting rid of your cap at the same time.)