I thought this was a really interesting (and sometimes eye-opening) look at the evolution of communication...
http://www.phoenixrealestateguy.com/the-shift-in-communication/

Will email become obsolete? Probably not.

Kids aren't talking on the phone as much these days, but is that necessarily a good thing? When a phone call is over, it's over (ok, my kids aren't teenagers yet so maybe I'm way off base) but with texting, it's ENDLESS!