I think that's more of an excuse than a reality at this point. It's hard to find a major movie or TV show, beyond Netflix and Amazon originals, these days which isn't available for purchase on Google Play Movies, a service which works on Roku, Chromecast, Android TV, Apple TV (via Airplay), and PS3, PS4, Xbox 360, Xbox One, Wii U and most smart TVs (via the YouTube app) - basically every major platform. And even in those rare cases where something isn't on GPM, you have a fall-back option on almost every platform (iTunes, Cineplex, Microsoft and Sony stores, etc).
Yes, you sometimes do have to shop around and check the subscription services to make sure you're getting the best price, but that's hardly more arduous than figuring out which channel a new show you want to watch it airing on.
Yes, sometimes you do have to wait until a TV show is done airing a season before you can buy it, but other than HBO, with many shows you can now buy a season and watch each episode the day after it airs.
If you're waiting for a single all you can consume service (a la Netflix) that will have everything you want as soon as it's available for one flat price, that's already here. We call it "cable TV." If you want to pick and pay for only the content you want on demand, that option is largely available too, but you have to be willing to actually pay for it.