Our favorite shows are aided by a robust piracy community, which fuels Deviantart and Rule 34 (and people who who buy Danerys Targaryen Toaster ovens).
The shows that get cancelled are the ones with insufficient appeal to the mainstream (and Hollywood elites who think they know what Americans want), such as all the shows that had lesbian appeal were cancelled.
The other fate of a show is a season 7-8 of shark jumping moments, worsening in context the prior seasons. Like making Danerys Targaryen go mad at the perfectly wrong time in the finalé so the story doesn’t end with a queen in power.