What differentiation? Most work is bread-and-butter after you get a few years of experience. If you LLM's can automate 50% of that, it would transform society already.
All of it relies on learning and information processing capabilities that LLMs simply do not have. The idea that any of it will automatically emerge from the current architectures simply by adding more parameters is about as sensible as thinking that if you keep counting long enough eventually you’ll get to complex numbers. We’re going to need to invent new technology to fill these gaps, and there is no way of knowing how long those developments will take.