That is the "problem" with the farm system. While very deep and highly rated, which prospect actually projects as a superstar hitter? There are a lot of potential supplemental roster pieces and likely some solid Major League starters. Those are very nice to have, but I still don't see where the top end talent comes from. MAYBE Caissie ends up being one of those guys if he continues to progress, but I just dont' see any other true impact bats.
On the other hand, there aren't many Soto's or Ohtani's around. IF Soto does hit the free agent market this offseason, the aggressive non-Jed thing to do would be to go all out and pay him whatever it takes to bring him to Chicago. The Cubs minor league depth is a significant asset that grants them the ability to work around a massive contract, should they choose to go that direction. Outside of trade possibilities, they can hopefully count on two or more of the group of Caissie, Shaw, Alcantra, Triantos, Ballasteros, etc. as cost-controlled Major League starters in the near future, joining other guys on the roster like Busch and Morel. They have the ability to fill several positions cheaply so that they can spend big at one position to get a true superstar bat.
Do I think that type of move is on Jed's radar? Not at all. He is unlikely to go anywhere near Soto's price tag, and will instead spread that money around to multiple guys that are only marginally better (if at all) than the Cubs' cheaper internal options.