I've received a message on my IDF app stating that they have stopped selling cardboard tickets from 21st September. My daughter purchased a Navigo Easy pass for me yesterday so my worries should be over.
Ouest-France reported this as follows (automatic translation):
From today, it is no longer possible to buy a booklet of ten cardboard tickets for the Paris metro. "The single ticket will remain at least until the Olympic Games, because we will welcome millions of people. But at the end of 2024, it will take its final bow", said the president of the Île-de-France Region, Valérie Pécresse, at the beginning of September.
Until then, for all regular RATP users who wish to keep a certain freedom, the Navigo Liberté + pass is the best solution: simply validate your pass at each trip, these are counted at the end of the month and the bank account is debited the following month. For occasional metro users, it is better to opt for the Navigo Easy pass, sold for €2.10 and rechargeable at will. Last possibility, finally: validate your ticket with your phone via the Île-de-France Mobilités, Assistant SNCF and Bonjour RATP applications.