What is the importance of the indoor soccer field in The Wolves: A Play?

In her preface, the author makes the clear suggestion that the indoor soccer field is intended to represent the "bubble" of "American exceptionalism" (9) in which the characters live. While there are references in the Introductory Information to this setting having a feel of going on forever (a metaphoric comment on the belief that American exceptionalism will go on forever, and is the only possible mindset for these characters and their fellow Americans), the author and the action of the play both make a very clear statement of advocating that breaking out of the moral and psychological boundaries of the "dome" (i.e. the above-referenced "bubble") is necessary and valuable.