TV channels air nothing but reruns/repeats of decade-old shows.

TV channels air nothing but 10-year old films and tv-series on repeat

TV channels do nothing but show the same movies and shows from ten years ago again and again.

Television stations/channels do nothing but play and replay the same old movies and series from a decade ago.

All the tv stations/channels do is play the same movies and series from a decade ago again and again/over and over.