Of course this phenomenon has been happening since language first became a thing, but the rate at which it's happening has not. The most cynical part of me fears that places like courts, government institutions, academia, and other sorts of walled gardens will soon be the only bastions well-written and cogent language (and that this will happen before the end of the century). I don't know...maybe it won't. But still.
I'm no professional linguist, but my understanding is that there is less variation in language now than there was a century or two ago. When travel and communication were more difficult, you did not see speakers across a nation using uniform language patterns as much as they do now. Not only that, numerous languages we had only a century or two ago have been replaced, and some predict "that 90% of the circa 7,000 languages currently spoken in the world will have become extinct by 2050." This is sad to me, as I would prefer the preservation of linguistic diversity. I'm pretty sure you have little reason to expect there will be an increase of nonstandard language patterns.
