McGowan does say that going back to 2-channel after listening to surround is a real letdown, and that he was very impressed with Gus Skinas' surround system.
It is very true that space can be an issue. With all three of my surround systems beginning with the days of quad, I've been fortunate to have a dedicated room. Still, most people should be able to install a modest surround system in their living rooms or dens. My brother-in-law has such a system with small wireless surround speakers and a sub. So no big speakers or unsightly wires going up the walls. It sounds pretty good.
Lack of material? Well, we've been over the reasons for that ad infinitum here.