Noone, nor any newsppr, ever said it was to be the full all-30days variety. Might just as well be the 5 in 15 or 10 in 30 pass.
in BElgium, young people (forgot at which age 16/17/18?) get a free GOpass (10 national rides) from their govmt- thus around half are then offered for a little cash at an e-bay lookalike site.
Also note that the EU has several countries that do have railways, but do not accept IR: The 3 baltics, and then the island-states of Malta and Cyprus have none at all. AND that IR-scheme is also valid in non-EU countries, like Serbije, Macedonia, Turkey and in the distant past even in Morocco-long since gone.
Following some IR-specific fora, about all newbies either want to visit the capitals of as many countries as possible by using night-trains (which are ever less and less) and seem to think only direct no-change through trains can do the works for them. Here in NL all head for AMSterdam-overcrowding the Berlin-AMS 2 hourly IC-trains to the hilt in summer without a hint of making some stops on the way and using other trains to do that.
Saw some other calculations on a forum, that the daily average of 22.000 INternational train pax here (at least half of these are very short local shopper trips, like germans from Gronau shopping in Enschede or Dutch people going for the saturday to Antwerpen) could rise by 50% if only half of potentail users would visit NL.