I don't have an intelligent or answer based on personal experience for raising a potential pro player.
I think we can all agree that results at a young age really should have no effect on a child's later potential.
What I just wonder though is whether losing a lot when young could possibly have a negative effect by getting the child used to losing?
I can think anecdotally of the williams sisters who were very dominant as young juniors and then didn't really compete in organized tournaments until they were professionals. I have to wonder if the early dominance made a profound effect on their mental game -- in thinking they always should and would win over anyone else.