There is a solid group of 1/2A fliers that will keep Cox engines in the air for a long, long time to come. I'm one of them. Just check out the 1/2A forum here at RCU. Parts are not hard that hard to find. I had more trouble finding parts for an OS SF .61 than I have had finding Cox parts. Granted, the picture may be different in Finland.
Honestly, I've never bothered myself worrying about what the majority does. I don't belong to it anyway. I love 1/2A and older engines, so that's what I fly. I can't imagine ever running out of Cox engines, they made them by the millions.
David