New airports far removed from the metropolitan area they purport to serve have a long history, generally being proposed and championed by imbeciles with no experience of aviation, or transportation generally, who have some agenda of their own to peddle.
One thing they never do is propose to back the plans with their own money.
There have been a few actually built over time. Montreal Mirabel is a typical example. Huge area of virgin land, far from Montreal, razed to build it in the 1970s. No airline wanted to go there, so international carriers were compelled to. No domestic operators transferred there at all, they remained at the old facility at Dorval, so it became impractical for international-domestic connections, and all of this business was lost to Toronto, along with many international flights and much business influence for the city (Montreal used to be the No 1 Canadian port of entry and comercial hub; not any mre after this fiasco).
Eventually international carriers were allowed to choose which airport to use. The whole lot walked back to Dorval overnight and Mirabel was left abandoned, and finally closed, a monument to those who think they know better than the professionals in the industry.
I see Tokyo is just starting to allow international flights back in to old, central, Haneda, having forced them all out to the new, remote Narita that nobody wanted since the same time. Looks like the same is about to happen there.