From Epic to free verse: poem evolution

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Reading through Franco Morettii’s Graphs, Maps, Trees made me think of the evolution of poems as a form of literary production. In his book, Moretti states that politis plays a major role in the repression of books publishing, and book trade. If one make a chart of the literary production there are other cultural reasons for the rise and down of a certain literary genre. By taking into consideration the factors that may play a role in the changes of the poem form, from the popular long poems and epics to the modern short poems, one can see the parallel process of the development in poetry and technology, which has a direct affect too. For example if we think of the time and environment, old poems tend to be long because they were suitable for the simple life of the time. People had the time to meditate, listen and enjoy such a long production. Unlike the age of printing and the medieval age , where life begun to be more complex, and publishing enabled people to have access to wide range of reading, poets began to write shorter poems that are easier to be published and faster to be read. The following video is a summary of Beowolf epic; it is presented with the help of the new technologies that served to summaries the long poem that is unreliable to be read in our hyper reading age.
http://www.youtube.com/watch?v=8SiarUS3ddA&feature=related

            Another thing to be noticed about the poem, is the change of its verse from the dominant theme of being rhymed into the modern free verse. This doesn’t mean the decline of the rhyme, but rather the emergence of a new kind of poems that is free of this condition. The poems were mostly written to be read loudly, that’s why they tend to be musical to the air. But, the modern developing technologies enabled a new kind of poetry to be emerged, and that the aesthetic value of the verse is tend to be in its abstract merits rather than in the form. In this video a poem called Silence is an example of where the poem is going to in the modern life; the poet uses artifact that contains images and music, which helps to illustrate the lines of the poem:
http://www.youtube.com/watch?v=6wjhqmGlOzI&feature=related
as we see, by relating the word to an image, thepoem is turning into a visual peice that is interesing to be read although it lacks a ristrict rhythmatic  form.