Most of the posts seem to be how to turn text to speech, and even those are old. There are enough free programs around to do that, it's not a big part of being in a text-only or mostly-text world.
I don't speak. I don't want to hear me speak (imagine a drunk 10 year old with a speech impediment who doesn't understand English). I don't want to hear others speak (since I can't really understand them anyway, it's kind of pointless).
Sometimes text is all there is - and the more often the better.
Send me an IM, don't call me on the phone - you'll spend most of the conversation saying "what?" in answer to me trying to say "what?".
I finally got my office to be text-only. I stopped going to the office and my home phone answers "the person you are attempting to speak to can only be reached by emailing email@example.com and requesting an appointment".
It actually worked :D !