Sure, market size, effectively increased both by population and lower communication costs, does further undermine monopoly arguments. http://works.bepress.com/tom_bell/1/ is a good paper on this.

But AFAICT this level of sophistication just about never underlies calls for reform based on "new realities", "digital age", etc. Rather ahistoricism, fetishism for both the internet and founding slaveholders, and the like.