Yeah, so much for the “episodic content” experiment. My colleagues in game development always shook their heads at the idea as impractical. At least Valve have actually said, post-Episode 2, “Episodic content? Yeah, we’re not doing that anymore.”
I can actually think of a few other games that ended on something of a cliffhanger, presumably to leave the door open for sequels that never happened.
It’s sort of like the 1978 The Lord of the Rings.