That is plausible. It depends what you mean by "megacorp." If what we mean (in contrast to artisanal craftsmanship) is just industrial scale operations - then yes, we certainly can organize industrialization differently than megacorps. Smaller sized corps, State-owned enterprises, co-ops, federated mutualism, and more, are all possibilities. But if the suggestion is that we could support modern population levels with just traditional production methods - that probably is unlikely. To steelman the argument, maybe proponent could suggest something like advanced permaculture. I'm skeptical that would work, but something along those lines is a possibility.