User blog comment:Argorrath/Sledgehammer Games claims to be working on a new MW game/@comment-1187559-20130722034715/@comment-2224625-20130722152428

The thing about Star Wars was that it became two trilogies: the Prequel and Original Trilogies. All other material was considered Expanded Universe, and many were comfortable keeping it that way. The new movie, unlike what you say, has actually caused a bit of strife with Star Wars fans. I would know, I'm a big one. There are many issues people are finding, such as Abrams directing it, the guy who wrote the Hunger Games writing, and the Star Trek costume designer working on costumes. So yes, there is bitch going on about Star Wars. As for the prequels...many hated them. And more hated The Clone Wars (though it was a decent series, but I'd like Karren Traviss back writing Republic Commando)

Halo 4 was made by a seperate developer, no Bungie. Halos 1-3 (including ODST and Reach, an expansion and outside the trilogy respectively) is Bungie's trilogy. All other numbered games afawk will be another dev.

The point is people did complain about some things going beyond a trilogy. As visualized here, when the story seems to end...then it's probably not wise to go further. And doing a prequel has its risks too.