I think it's totally worth including licensed games which should have been their own micro-franchise yet never got follow-ups. (Especially since these games rarely get re-released since their license agreements get so complicated over time; Star Wars Republic Commando seemed like it was going to fall into that category until its surprise remaster recently.) Some of the biggest sellers on certain platforms were brand-name games that you would have thought you'd see a half-dozen more of across major platforms, but instead they were one-and-done. (A few didn't even really launch their developers big, despite the sales numbers and sometimes review scores.) It's a different category in terms of how they succeeded yet how they were left behind, but its still in the math of what we're talkin about here.
A few licensed games maybe worth mentioning:
* Simpsons Hit & Run
* Walt Disney World Magical Racing Tour
* Die Hard Trilogy / Alien Trilogy (same year/same developer, then never something like this again)
* Cool Spot
* Mad Max
* X-Men Origins Wolverine (thankfully, there was no X-Men Origins 2 movie... but ultimately, Raven never got to make something like this again)