People often complain about the so-called decline of the English language. They cite things like pork, ramen, and punctuation as evidence that standards of English are slipping. But grammar tends to get more mentions than anything else. The reason is probably because there isn't so much of it. You can complain about vocabulary, but there are tens of thousands of words you can complain about or worry about. There's no correlation whatsoever between issues that people think of as a sign of decline and the sort of thing that actually goes on in text messaging and the internet generally.