@DTG: Let's say you make a great movie with spectacular action sequences and a great story. How is it possible to make a better sequel/prequel? The onlyl way you can do that is to write a really great script and deliver as much, if not more/better, spectacular action sequences than the original. How many times can you do that? Once, maybe twice? By then, the magical feeling is over. It's passive entertainment, you can just "watch" a movie.
With a game it's totally different. There's not only a story you get to watch, you can also "play" it. The Play part is the part a game developer can really improve on and innovate. Particular with the MGS franchise you can see how the gameplay evolved from MGS1 -> MGS2 -> MGS3 -> MGS4.
I understand that with a story-driven game like MGS there's gotta be a time when there's no story left. In that case i agree that a franchise has to die. Like with MGS. The only thing i do wanna see in MGS's future are remakes of MG1 and MG2:SS.
But the point i wanna make is: when technology constrains a game's gameplay(which is the case with almost every game), a franchise can have a very long and bright future cause there are a lot of things to improve on. Unlike movies. This accounts for all games, except heavy story-driven franchises like Bioshock, Metal Gear Solid and Half-Life. (don't be confused with heavy story-driven franchises where each title has it's own individual story)
