CoD doesn't need any help they are killing their selves.
Destiny will survive just fine. It's not based on their multiplayer. It's based off of the co-op. Problem with a lot of games is that it relies on the multiplayer aspect to be successful. If they support the game and do content the way they say they are. It will last a long time. Halo 1-3 were all great multiplayer and campain games.
You can actually get up into their spawn. If we get a chance to play I'll show you. You have to climb to the top of the tower next to their spawn and you can make the jump and wall run up to the ledge