I don't think you can really draw that conclusion. Even if local build-on-demand factories end up entirely replacing shipped goods, 27.5yrs is probably pretty

I don't think you can really draw that conclusion. Even if local build-on-demand factories end up entirely replacing shipped goods, 27.5yrs is probably pretty close to a minimum timeline for that happening. Any huge systemic shift in the nature of physical goods like that will take a very long time.