I don’t know that we’d say less.. probably because I tend to be much more lengthy when I’m writing then speaking, but that’s just me.
Maybe it would give us more of a chance to revise our words. Writing appears more permament once it’s sent out, so being more careful with what you write is normal. But if someone’s angry enough, they may go and send the writing without much thought, much as people say things before thinking through…
We’d have to develop a more complex writing system, because as efficient and effective as the written word is, it often needs someone to put to it inflection and emphasis at appropriate points. Without ever having heard, or spoken, that layer is gone from what can be communicated.
Italicization and CAPITALIZATION and smaller fonts and bolding would probably become used more and more, in an attempt to bring that back.
Different spacings, more punctuation, etc, as well.
We wouldn’t be able to interrupt each other, because we’d all have all the time we wanted to write out our complete thoughts. In that way I find it very nice.
I’m going to get a bit technical here now… but since it’s writing as communicating that gets rid of all forms of communication, not just talking. Pictures, artwork, dance, body language, math—if numbers aren’t considered writing—etc.
Things like smiling and crying would be ineffective. We’d have to rely entirely on : ) and :.(
Only getting one medium of expression when we all use well more than one… it would be limiting. Maybe not as much as using a method that isn’t as widely used, but still very limiting to have it as the only option.
(Even on Fluther, a written question-and-answer site, purely words aren’t used, we get external links for when words are inadequate, ineffective, not as good.)
I’m guessing people would adjust, but it’d be a difficult adjustment at first.