I know that Hideo Kojima said that he would never remake MG and MG 2: Solid Snake, but my dream Metal Gear Solid game would be as follows:
Half the game could be played as Big Boss forming Outer Heaven in Africa (as it originally was) and the second half could be played as Solid Snake.
Snake's part can take place 8 - 10 years after Big Boss' part, just the same way that the Big Shell Incident in MGS 2 took place 2 years after the Tanker.
In the 2nd part of the game, Solid Snake could infiltrate Outer Heaven, have the infamous "fight against Frank Jaeger in the minefield," destroy Metal Gear D and take Big Boss down.
The end scene could include Frank Jaeger recovering in the hospital from the minefiled fight, being fitted with the cybernetic ninja suit, escaping and slicing people up on his way out.
It would lead right up to MGS 1.
End credits blackout cut-scene (audio only) = Liquid Snake speaking to Revolver Ocelot about taking over Shadow Moses.