Are the Paris traditional bistros dying out - yes, but...

This is the kind of food I travel to France/Paris for for the last 40 years and yes, many are dying out, but thankfully, some still survive.
Since the1880's, Josphine Chez Dumonet has been serving the Paris perennial  favorites of old fashioned dishes like boeuf bourguignon, duck confit , gigot d'agneau, to name a few and yes, some of the patrons might look like they were here for the grand opening. 

It's a true French bistro you've always imagined right down to the communal pot of pickled herring, the gruff waiters and a red gingham toilet.
The serving sizes are very large, so prepare to come with a large appetite. 

Be sure to save room for the mean Grand Marnier souffle ( as big as your head)

The Bistro is really known for its Boeuf Bourguignon