It really depends on the rink. There needs to be both at least one coach who is capable of teaching successful double axel/triple technique and also at least one skater who has both the physical potential to master those jumps and the resources and commitment to invest enough practice and lesson time to get there.
At a rink with no local coaches who can teach triples successfully, then even the most talented and committed skaters won't learn them there. If they start getting close, they might go elsewhere for lessons, but it would take even more commitment to relocate or add a couple hours of driving several times a week to a different rink.
If a rink has one coach with that ability, then at any given time there will be as many skaters with triples as have the physical potential and take lessons from that coach and have put in the time and work. Some years there may be none, or one, and other years there might be several.
If there are more coaches with that skill, then there will probably be several skaters landing triples. And the rink might become a destination that skaters travel or relocate to in order to get that coaching and training environment.
At a rink with no local coaches who can teach triples successfully, then even the most talented and committed skaters won't learn them there. If they start getting close, they might go elsewhere for lessons, but it would take even more commitment to relocate or add a couple hours of driving several times a week to a different rink.
If a rink has one coach with that ability, then at any given time there will be as many skaters with triples as have the physical potential and take lessons from that coach and have put in the time and work. Some years there may be none, or one, and other years there might be several.
If there are more coaches with that skill, then there will probably be several skaters landing triples. And the rink might become a destination that skaters travel or relocate to in order to get that coaching and training environment.