Even if it were true that today visual communication overwhelms written communication, the problem is not to oppose written to visual communication. The problem is how to improve both.
Reference: Eco U. (12, Nov. 1996) From Internet to Gutenberg – A lecture presented by Umberto Eco at The Italian Academy for Advanced Studies in America [Online] Available: http://www.hf.ntnu.no/anv/Finnbo/tekster/Eco/Internet.htm