Here is a prospective thought of mine. Gemba Walks are a one of Lean’s tenet and any practitioner is urged to go around the Gemba and see for him/herself in order to learn, understand and eventually improve processes.
But where will we Gemba Walk when most of the processes will be digitized?
How to observe virtual processes? What will remain of the beloved Value Stream Maps (VSM) when most of the value will be created in the heart of information systems, totally invisible and so fast?
My guess is that future observation will happen in the digital twin and process mining will be the new VSM.
Good old VSM will tell few about the remaining physical flows. Where once 5 to 10 different operations were required to manufacture one part, a single 3D printing operation will do.
It is likely that tooling changeover will disappear, hence the need for fast changeovers with SMED.
Those new processes are likely to be leaner than actual ones.
Food for thought.