There was more variation in language before the courts of Europe began dictating the usage of standard dialects. Languages may have changed even faster in the past than they do now (not counting the vast increase in jargon we have in the modern world). The internet may not have publishing gatekeepers like books have had for centuries, but like books and the courts of yore it probably still does more for encouraging people to use the same language patterns rather than different ones just because it's so accessible. If the movies of Hollywood have influenced the usage of English worldwide, how much more so would YouTube? Long before the internet, multiple Latin American countries started chopping off certain sounds in Spanish words. Although it makes it difficult for other Spanish speakers to understand clearly at first--and they may feel like their language has been maimed, as you put it--the ones doing the chopping seem to communicate quite easily with one another.
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.
