Large organisations are modelled on the military. So were schools. And many more countries had compulsory national service. Now schools are evolving and university with all its freedoms is more likely experience than military service for most new entrants to the workforce, it's not surprising that a huge, rigid, hierarchical structure is no longer relevant or even tolerable to many people.
Another point to bear in mind: more small companies means more outsourcing, particularly for legal, HR, IT support, and so on. We should also see masses more companies using shared business premises, with shared receptions and so on.
Small companies should also mean more teleworking, since (1) people in small companies are generally more open to the idea of it, and (2) it's easier to keep track of what everyone in a smaller company is doing, even if they are working remotely, and (3) it means small companies can have international representation which may be one guy in a specific Asian country working from a bedroom-office.