Genre stuff has a hard time surviving on broadcast, and cable certainly skews serialized. Broadcast and cable are just following what their respective audiences want. So if you like episodic shows, you're going to have to start liking cops/doctors/lawyers and sitcoms.
Or maybe all this YouTube TV stuff will take off, and we'll all be able to get the micro-niche stuff we want. You can have your episodic fantasy, and I can have heavily serialized space opera with a grittiness factor that hits midway between DS9 and nuBSG. Exactly midway, not 25% or 75%, exactly