Yo be patient mate!
SA hasn't been well managed for a few seasons now. We have to rebuild! I'd not worry too much if I were you:
the current U21 squad features:
- 1 HOF
- 2 MVP
- 4 superstars
- 5 p-allstar
of course, they're far from the NT level yet... but if trained decently, I bet they'll be more than useful in 4-5 seasons.