CABLECard is dead and until the FCC gets sabers rattling against the cable conglomerates for cable box reform (again) and (presumably) universal cable apps, it's tough for anyone to support TV on the computer. (Yeah, that leaves broadcast and broadcast is still open, but broadcast alone has never been a priority for Microsoft and there are still vendor/OEM apps that work with broadcast tuners in Windows 10, at least.)

The apps that Media Center was split into are getting better in Windows 10 and with the Anniversary Update and the Xbox One in mind are getting better support for running on couch screens again, but TV viewing is something that currently seems like it will take a while to sort out thanks to the cable conglomerate stubbornness and also the Xbox One needing to pivot and meet gaming stubbornness first over the fight to rebuild a modern Media Center (aka "OneGuide" now).