If this was remotely true (and it isn't) MS wouldn't be trying to spend $70B trying to buy this company.
It's a completely inane statement. There is no single FPS franchise as prolific and successful as COD. Even if you individually don't like it, it's irrelevant. No one has been able to replicate COD's success and your clear evidence for this is the PS360 gen which was fucking jam-packed with failed attempts by completing publishers: Battlefield, Socom, MAG, Medal of Honor, Resistance, Bodycount, Section 8, Operation Flashpoint, Brink, Homefront, Killzone etc etc.
COD is to FPSs what GTA is to open-world city sandbox games. This is why at the investment-cost level of games today, only mega-franchises like these are the last remaining survivors.