I'm not so sure, and I'll explain why below on one of your points.
> in the end garbage collectors will refuse to pick up garbage at their warehouse. Electricians will refuse to service their warehouse. Plumbers will not plumb. Workers, builders, postmen etc will all simply stop servicing Amazon. Companies that deal with Amazon can also be put in a blockade.
Outside of employing builders directly, it's my understanding that Amazon has previously operated in-house alternatives for those, particularly to reduce the costs in their supply chain and operations. I wonder if this would lead to Amazon instead scaling up the self sufficiency instead?