1: "The Ephemeral Afterlife of ER SpinOff Shows: A cautionary tale on franchise extension."

2: "From ER to the ER spinoffs: how the franchise tried to expand its reach."

3: "Overextending ER: how too many spinoffs can dilute the original essence."

4: "The perils of franchising: ER spinoffs serve as a cautionary example."

5: "ER spinoffs: a look at the fleeting lifespan of extended franchises."

6: "Lessons from ER spinoffs: why some franchises are better left untouched."

7: "Risks of overextension: why ER spinoffs struggled to maintain momentum."

8: "The rise and fall of ER spinoffs: a case study in franchise expansion."

9: "Knowing when to say goodbye: how the ER spinoffs grappled with their own mortality."