The curious, interesting observation that has to be made about those Top 5 oldest stadiums still in use today is that also, a decade from now, the Superdome and also Lambeau Field will likely be the only two stadiums still hosting NFL games. Chicago, eventually, whether its in the city or more probably, Arlington Heights, are going to have a new, domed stadium. The Buffalo Bills have a brand new, open-air stadium that will be ready, IIRC, by the 2026 or 2027 seasons.
Yes, the voters in Kansas City said no to public money to funding renovations or potential new stadiums for the Chiefs and Royals but both of those teams' leases last for another 6-7 years and Kansas City leaders, Chiefs fans, both teams fanbases actually do some more touch-and-go negotiations that may last a few years and might get tense at some points, I do believe both teams will get new stadiums. Missouri only has one NFL team left and right now, their a dynasty team that will remain competitive for the next decade as long as #15 continues to play at a high level. I would strongly recommend and suggest Hunt family pay 75-80% of the costs of any new stadium and if push comes to shove, its difficult for me to imagine the Chiefs not being in Kansas City and if problems keep arising, I can picture the NFL FO stepping in and pushing for a deal to get finalized.
As an aside, it's hard to believe now that for essentially 35-40 years, Packers played half of their homes games at Milwaukee County-Stadium, even Lombardi's legendary 1960's squads and good, sizeable portion of NFL fans today aren't even aware of it. This upcoming season will actually be the 30th anniversary of the Packers sharing their home games with Milwaukee. Honestly, 40-45 years ago, Lambeau Field hardly resembled an NFL-caliber facility even at the height of late 70's/early 80's cookie-cutter, multi-purpose stadiums. It looked perpetually old, worn-down, rustic, not the modern, state-of-the-art architectural wonder its gleams as now. The Packers of the early 80's had some promising, strong, talented teams but their ownership model, complete lack of success made them appear outdated and stuck in the past.
Their were actually very serious discussions in the early 80's about Packers moving permanently to Milwaukee and setting up shop in a more comparatively modern, forward-thinking, larger, market-friendly city like Milwaukee and several then-Packers stars, like James Lofton actually came out and publicly said he preferred playing in Milwaukee and wanted the team to relocate their for good.