Argument Theory--Thomas Goodnight

I am starting to see these different theories as merging into each other to create options for the arguer/audience/evaluator/social constructivist, etc. I was particularly interested with Thomas Goodnight’s distinction of spheres: personal, technical, and public. This very clearly, to me, relates to rhetorical argumentation in that we will construct arguments based on the situation (the rhetorical situation perhapsHow has the changing spheres (broadening or constricting) problematized argumentation? I am very interested in social argumentation especially where questions of class, race, gender (basically “otherness”) comes into play. I believe that identifying audience is more problematic than it has been before. For instance, one hundred years ago, political speeches were made to very distinct audience—whoever could be gathered at a specific place in time. However, with radio and television, spaces for debate and argument increased, thus creating a more (to use Perelman—who I love by the way) universal audience. Now, if we discuss the use of youtube, web sites, camera phones, etc, debates, speeches, etc can be analyzed by an audience and space and time constrictions are somewhat less a factor (there are of course access issues, etc). Speeches/arguments made behind closed doors to a specific audience can be easily recorded and transmitted to “public” spaces, thus creating an even larger universal audience. How does this affect argumentation both in terms of construction and evaluation?
Any ideas? (for anyone)