Of course, your man is the gold standard (pun intended

) for longevity with excellence in competitive sport and afterwards. And if I may dare say, not knowing as much as you, due as much if not more for his artistry and connection with the audience as for his technical skills.
I agree with the OP that, IME, the sport overall is served well by skaters with long careers. This is not the NFL, where I will root for the Eagles no matter who plays for them. This is skating, where we become attached to a skater and want a skater to do well. I suppose there are some who root for countries, no matter the skater, or coaches, but I personally find that impossible in an individual sport. I loved Toller Cranston beyond all others, and I am not Canadian and have no Canadian roots. That is the beauty of figure skating.
(And of course even in the NFL, encouraging longevity is considered a virtue. Players want to be, and fans want to see, Tom Brady, not some one hit wonder who sets records for a year never to be heard from again).
How to do it? Wow, that is the million dollar question...