I just finished MGS4(one year late, I know), and i noticed that the game don't let anything to be used in a sequel, all the Patriots, Big Boss, Liquid, Ocelot, Solid snake thing were definitily finished. Even the dialogue after the credits didn't let anything like the other ones did.
I think the only way the series can continue is letting all the old conflicts behind and creating everythin from zero using Raiden as the center of the story now, MGS:Rising just can't touch in what was finished in 4, it would be just making shit of something is already complete.
Maybe the should even stop to use the SOLID, and create a new series for Metal Gear.









