Seems more likely that Orange would just be producing 16x the mediocre C-tier work they were doing before. This scenario assumes that the problem from the lower-tier programmers is their volume of work, but if you aren't able to properly understand the problems or solutions in the first place, LLMs are not going to fix it for you.

Chances are Grape and Apple will eventually adopt LLMs because they need to in order to fix the mistakes Orange is now producing at scale.