Episodic gaming was one of those things that really seemed like it could have lasted forever, an idea whose time had come. For most of their history, video games were self-contained, one-and-done releases. Expansion packs and quick-hit sequels pushed against the constraints of this model, but the constraints of technology that was dependent on physical media meant that they couldn't really escape or challenge this model. A game came in a box, and if you wanted more game, that required another box.
This is a companion discussion topic for the original entry at https://www.vice.com/en_us/article/v74e44/why-did-episodic-gaming-die