The Chiefs have a lot of work to do in the coming years with Kelce close to washed and Chris Jones approaching mid-30s (he'll be 31 when next season kicks off) + the normal work of reloading the roster/filling in holes at O-line etc. Replacing your superstars is the hardest part of maintaining a dynasty...consistently finding good value starters and such is relatively easier but finding your big locker room and on field leaders is much harder. Not only the Patriots but the Colts, Packers, Saints, Steelers, Ravens all had major lull periods in the 2000s-2010s where they took a step back to reload the roster. The Chiefs may be approaching that period now, and if not then likely in the coming 1-2 years.
I have no clue if the Chargers and Broncos (and Raiders lol - hope TB12 can make a difference there in ownership group) can make that division competitive which is the real spoiler factor. We've seen plenty of years where the Jest, Bills, and Dolphins thought they finally had a team to challenge the Pats and it never really materialized, certainly not for multi-year stretches. I will say Jim Harbaugh + Justin Herbert are probably better than any HC-QB combo that we ever faced in the AFC East so they may stand a better chance, but that organization has historically been piss-poor so I'm not gonna bet big money on it.