I dunno why they just didn't focus on expanding MW for the next 3 years. They had highly polished game, excellent visuals, a huge amount of work went into the animations and people overall enjoyed it even if their original design philosophies around doors was a bit flawed. Cold War was a downgrade in every respect, Treyarch as per usual didn't bother supporting the game much post-release and instead reverted to their tiresome plan of giving us the same old maps we've played in every one of their games from the past decade.
Raven are doing a good job in killing Warzone where there's people even cheating in official tournaments so I think they are very much in a huge mess especially with people growing increasingly tired of the franchise and Battlefield finally making big strides. Soon they'll be focused exclusively on the mobile version and that's it.