How big is big? And do you not want computers that can do what modern computers can? It costs billions of dollars to build a single semiconductor fab, so without any big corporations, there won't be any new fabs (or anyone big enough to own an existing one), so we'll be going back to 70s-80s IC technology at best.

Like it or not, a lot of things require very large companies to get done. Small companies can't build jumbo-jet airplanes.