Just have the devs make the next CoD like this...from what Ive gathered over the last few years, this is what the community wants the most:
Put about 200 different guns in the game, but make them all have the same stats, so nothing can be called OP. Just make them all look and sound different to make the noobs believe they are using a completely different gun.
Make every map a perfect square maze, about 100x100ft. Then just make random new routes and call them "NEW" maps. Sell at least 10 map packs of the same thing for $30 each...thats about a billion right there.
Make sure you put at least 20 perks this time, and make sure each one has an equal counter so no perk can be called OP.
Make it so people spawn within 1ft of the enemy, this will be an improvement over the 2ft spawn distance in Bo2.
Also, make sure that every killstreak can be countered by shooting a few rounds off in the air.
A game like this would net you TRILLIONS easily.