It isn’t just New York and other urban / hipster areas. Even in areas outside of the cities with substantial older populations, the diners are disappearing. And the ones that are left are DINO — diners in name only. Pre-processed food at high prices. Simply cashing in on the nostalgia. My grandmother and grandfather used to go to the Limerick Diner in Limerick PA several times a week for years in the late 70s and 80s. I used to go a fair amount too. Then new ownership increased prices substantially and downgraded the quality of the food. Another diner that several generations of my family went to in Phoenixville, PA — the Vale Rio Diner — finally went belly up too. Its a shame.
There is a magazine called Good Old Days, filled with stories of life in the mid-20th Century. This magazine has been around for 60 years. When it was first published, the stories were based on life in the 1890-1914 period. Fifty years from now, it, or an electronic version thereof, will be filled with stories about the early 21st Century.