- The hobby could just die out.
- Amateur radio magazines will get hard to find (they are hard enough to find now!).
- There will be fewer ads in magazines for new gear.
- Manufacturers will stop making amateur gear as the volumes are too low to make a profit.
- Dealers will close.
See http://www.southgatearc.org/news/2019/november/germanys-darc-faces-an-aging-membership.htm#.Xd0n6e2TLnE