Former Saints starlet Bale is back in the Premier League after rejoining Saints' weekend opponents Tottenham from Real Madrid.
"I don't know if it's possible to come back to what this academy once produced because you can see more and more that especially the big clubs are hunting very, very early for these big talents," said Hasenhuttl.
"Even there you have, as a small club, no chance to get them anymore.
"Because of this, the younger players at even 15, 16 - it's too late to get them in. You have to have real luck to find somebody who is not shining too much that immediately a big club takes him.
"They are very, very aggressive in this market. You can see it in Germany, it's all over the world now that they are hunting for the big talents.
"They see that it is sometimes cheaper to get a young lad in paying for him maybe a few million and not 50 [million] when he is famous. This is the reason why a lot of teams do this and then it's difficult for us to find them.
"What we can do is what we have with our knowledge, with our expertise in every part of this club is to develop them in a way that is a little bit different, playing a different style but that can make you a very big player even if you don't have the highest talent."