As I understand the situation Copal shutters have ceased production but the likes of Rodenstock still have stock (I just bought new 32/70HRs with Copal 0 new from the factory without any problems). There are plenty out there but ultimately new stock will dwindle.
Also, there are plenty of repair shops that will always be able to service the many thousands of mechanical shutters out in the wild. However, I recently tried to purchase a replacement sync post part for a Copal 0 shutter and the web dealer who specialised in spares had just had his entire stock of spare parts bought up ... I ended up getting the part fitted by a local repair shop but bits are getting more expensive ($25 for a sync post for example).