> [E]very customer who crosses the threshold is greeted with a bright and cheerful ‘bonjour’

I have been to many bistros since moving to Paris in March. This bistro must be very, very different from others - unless the author is saying this just to reinforce their narrative and image of the bistro. Parisian waiters are notorious for being busy and hard to catch.

That being said, it's still a very nice and iconic part of Paris and a good place to socialize. With all the tourism I doubt that we'll see a mass-closing of bistros. Changes in society, consumer habits and demography will of course drive change, though.