Nothing. there never should have been the nuke. No game ending kill streaks ever in the game.
1. Having whole-enemy-team-killing killstreak (ghosts) just available for doing some silly in-game task is BAD IDEA.
2. Having NUKE (mw2) which can be get by sitting in corner of map and waiting for your killstreaks do kills for you is a BAD IDEA. (Tho I loved nukes in mw2 )
3. Having very hard killstreak which can be done by weapon only and then get silly badge for that is A BAD IDEA. (bo2)
4. The only good idea was MOAB in mw3.. Good player MUST be rewarded in-game for getting big killstreak with gun only.
The best solution for me would be MW2-LIKE NUKE achievable by MW3/BO2 conditions (the harder way).
if you look at the Call of Duty Ghosts Multiplayer trailer, at around half way through the video it a nuke like object falls from the sky and destroys most of the map
nothing. Rather not even any reward that kills