Ghosts 2 is highly likely in 2016 based off the ending. Or at least a sequel continuing off of Ghosts story like how BO1 was a sequel to WaW.
Extinction should be continued as the "Scattered pockets of armed resistance...in Europe and Asia." (Loading Screen Quote) This is the only quote that isn't talking about the story we know and have completed, it is talking about something going on still far away from where CIF 1's story ended. Just wait, we will be fighting those Cryptids on the Eiffel Tower!