I have got to say this : No tech is considered outdated untill proven worthless, the others are just a case of a habit - For example - some might say that *.pdf books and audiobooks should have conquered books and obsolete them long ago yet there are many people who still cannot imagine reading a book on a computer (or worse) an i-pod screen. And what about those who are romantic - would You trade the romanticism of an intimate romantic candle-light situation to an crude but more efficient electrical light ? I don't think so
Mail in a way is superior to an SMS/MMS too in that matter - You have a persons own words scribbled by that person , there is a charm and "the magic" that cannot be replaced by a binary code of series of digits on electronic screen
As a technician I can also say that analog signal (especially in music) is far superior to digital so called "High Definition" signal
Therefore I'd say that "all that glitters is not gold" and we should be mindful of the old ways when inventing a new ones