They're being replaced by another generation who feel that these minor intellectual niceties are merely boring and unnecessary and that a properly written argument has no more weight than an error-filled one: "What's the big deal, you know what I mean anyway."
In the example I just posted (#msg-39018998), a reader would have to do some fact checking to even know what the Dow Jones author intended to say. (The author intended to say 136 thousand barrels of oil per day rather than 136 million, but this wouldn’t have been clear unless the reader was already familiar with Addax Petroleum.)
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”