Existing factories that aren't yet automated and employ all 100 workers already depend on upstream providers. They already need parts and processes, they already need the tools the human workers use, they're already courted by sales people. Not to mention, they depend on uniform services, on-site nurses, healthcare providers, maybe cafeteria workers. Because their spaces have to accomodate humans, their factories have to have certain sized doors, passages, have to meet a bunch of safety standards. They have to lease land for parking lots, hire security guards to make sure cars aren't getting broken into, etc.

I think its kind of naive to just point to a shifting supply chain as if that addresses the problem.