Gears 5 was a colossal failure. It sold terribly and Rod was shitcanned shortly after its release.Oh man, remember that time Nintendo wouldn't let Sonic on their console? This isn't how stuff works, man. Also, Halo and Gears are far from dead. I don't know where you get the Gears thing from, specifically, its the only thing Microsoft actually still makes anymore.
Gears 4 and 5 are pretty universally panned, actually. Even Cliff Blezinski has spoke about how disappointing they were. Must suck for him to see his creation mismanaged to this point.