Can you imagine playing a FPS with hundreds of players..... Blood bath!
"Microsoft to offer dedicated servers for all Xbox One games"
"With server-based multiplayer gaming, not only can more players play the game (think hundreds of players simultaneously), the gameplay will be much more reliable for the players," Microsoft said. "No more host migration interruptions, suboptimal experiences for the host, home network NAT constraints, or player cheating."
http://www.gamespot.com/articles/mic.../1100-6415607/