Hi Sady,
This isn’t directed towards you as your short post doesn’t really say much about where you are coming from.
I disagree that top coaches need to have automatic access to top athletes to ply their trade. I can think of numerous domestic and international coaches that have been successful both performance wise and within the coaching community, purely through the development of their own athletes. Sometimes they will lose those athletes, but before too long they have developed another.
A comment from one particular coach exemplifies this for me: I expressed by sympathy for him as his star athlete (whom he had developed from scratch) had just unexpectedly switched coaches after numerous successful seasons. His only reply was: “Yeah it’s disappointing. You get this but you know me; I’ll just have to create another one”. Although he hasn’t done so yet (this is only a couple of years ago), his record leads me in no doubt that it’s only a matter of time.