Open source is by volunteers if you count it by volume. But probably not if you count by impact. Especially not if you include all the accompanying things like maintenance, packing and running software.

I think what is lacking from open source is reciprocity. Traditional copyright is extreme in that it reserve almost all rights. Open source is extreme in that is reserve almost no rights. The result is the same, the middle men gets all the power.

It isn't going to happen though. Because what is going to happen already is and it isn't that.