I also forgot that, despite your experience, yankee stadium and citi and largely a push for Manhattan residents.
“The Island” suggests that Citi Fied is a similar spot to Belmont, Roosevelt or Aqueduct, which is not a fair assertion. aqueduct is literally in the middle of nowhere, even inconvenient for most people in Queens despite being in Queens. Belmont has limited railroad service, zero subway service and, like Roosevelt, is not in the City. Each is significantly harder and more time-consuming to get to for fans than WP.
Also, let’s not forget that the Mets sucked and still drew 27k a game in ‘18, north of 30k in ‘17, 34k in’16 and nearly 50k as recently as 2008, when they were tops in the NL (the year of the choke and last year in Shea). If the Mets have an attendance problem relative to other teams, it isn't the location's fault. Blame fairweather fans.
Also your 13 million number includes 5 million people in Staten Island and northern jersey and many others in outer counties for which neither destination is convenient .
I don't think anything that's happened at the Meadowlands or Nassau Coliseum is relevant to the WP site.
I believe that facts show your intuition is off on this one.