Xbox Knows Gears of War and Halo Can't Carry Its Future, But Now What?

I know this probably sounds obvious at this point, but Xbox can't keep asking Halo and Gears of War to solve problems those franchises never created in the first place. Don't get me wrong, I love both of them, almost equally, and I understand how important they are to Xbox. I'm also not remotely arguing that Microsoft should just shove them in a museum and pretend Master Chief and Marcus Fenix are ancient artifacts that don't matter anymore. Xbox would be foolish to have those franchises and not use them, even today. The problem is that using them is not the same thing as building a future around them.