In Dominion, a new gametype introduced in Halo 4, you have to capture bases and prevent the enemy team from taking yours.
In Firefight, you had to hold off endless waves of enemies.
At some point in time, I thought: why not mix these two? My idea was to select a base site, add things like turrets and whatnot, and hold off enemy Spartans/Covenant/Prometheans (selectable in options), whose goal is to destroy your base. After each wave, you and your teammates could repair and upgrade your base.
Of course, then I remembered that the game’s already gone gold (and you can’t add friendly AI, which I still think sucks) and disregarded the plan.
Still, what do you think? Good idea?