typing vs handwriting

I wonder if some widespread sociopsychological effect will happen regarding changeover from handwriting to typing, brought on by computers and email especially. Given that writing began as a gestural communication leaving tracks as cuniform then other scratches on something, a more long lasting expression than vocalization, then "writing" is an extension of the mind. The manner and channel then would shape that process. Like changing the flow of water in a riverbed, the river then changes where the river goes.