Putting aside for the moment the ambiguity of “everywhere”, it is easy to see why Drama is a major artistic and literary genre, when we remember Josh Logan’s definition: "Drama is conflict.” Psychologically and socially, conflict (and therefore “drama”) arises wherever choices are made by opposing wills, by two or more objectives. In literature, what Aristotle calls Poetry, the three genres are separated by narrative types, and drama is “imitation by language without narrator”, a common means of communication and therefore ubiquitous in human discourse. As art, “theatre,” the imitation of an action by means of action, takes advantage of the non-narrative character of the dramatic genre by “acting out” the visual and oral manifestations of conflict – facial expression, gestures, proxemics, etc. – to tell a story. Drama is “everywhere”, then, because human communication, especially story-telling, thrives of this non-narrative form, both in art and and in everyday life.
"All the world's a stage, and all the men and women merely players: they have their exits and their entrances; and one man in his time plays many parts, his acts being seven ages."--William Shakespeare
Drama is everywhere because drama is literally the "any situation or series of events having vivid, emotional, conflicting, or striking interest or results". Real life certainly has a series of events or situations causing emotional, conflicting or striking interest. Additionally, any radio plays, tv shows, movies, etc. you read are actually drama. Real life is purely a stage and we are all players, as Shakespeare so eloquently put it. We are all playing various parts at different stages in our lives. Instead of acts (different segments of a play), our life consists of ages (baby, child, teenager, adult, retired, old, dying, etc.).