I mean, technically it's whatever was the latest game in the franchise before it died, but to squarely put the blame on that game would be harsh and naive.

Take Mass Effect: Andromeda for example, EA effectively killed Mass Effect before we even saw Andromeda because they took a huge IP with massive expectations, and handed it off to an inexperienced dev studio (and forced them to make it in a different engine, which probably didn't have nearly as many tools as the Unreal Engine to make a proper third-person RPG). Can you really call the game the franchise killer when EA threw it away like that?