I've seen multiple threads decrying the use of "textese" or "txt spk" (retching noise), and I'm glad. On of the reasons I like the escapist is that the user base seems to have a level of respect for intelligence, and that kind of respect is a rare thing on the internet.
But then today I actually saw this thread (http://www.escapistmagazine.com/forums/read/9.313258-Textese-seems-to-help-develop-english-skills-not-hinder) actually DEFENDING the use of text speak, quoting "scholarly" articles (that were not seemingly not peer-reviewed). These articles claim that the use of text speak shorthand, such as "plz," is actually helping people learn how to "manipulate phonetics," and, thus, text speak is not leading to a degeneration of language.
I'm not a researcher, nor am I a linguist or sociologist. But what I am is a teacher, and I'd like to offer up an anecdote:
During my first year of teaching I taught secondary English. Of course, when you have class full of 16 and 17-year-old students, everyone is going to have a cell phone, and the majority of my students were fluent in "textese."
I, of course, had them write multiple essays and papers over the course of the year, and on more than one occasion, I saw the use of slang and shorthand WITHIN ACADEMIC WRITING. When I explained to the class why this was unacceptable, several students attempted to argue with me, asserting "Why does it matter HOW I write it or say it as long you as you understand that I mean?" They were actually trying to justify the use of slang/shorthand/textese in academic writing.
In my experience, "textese" does NOT train a person in the "manipulation of phonetics." What it does is condition a person to believe that everything can (and perhaps should) be communicated as simply as possible. It also conditions a person to believe that it doesn't matter HOW something is communicated; the implied message is all that matters.
This line of thinking, this mindset, is definitely degenerative. Maybe not to the terminal point that some people believe, but it certainly isn't helping people learn reading and writing skills, as some people attempt to claim.