I had a conversation about this topic a couple weeks ago with my friend. We are in our early 20s and are heavy computer users. He was compaining about hearing a young girl say "kthxbye..." in real life. This went on into a 10 min joke conversation, role playing as kids years from now, who use todays IMspeak as spoken words. We managed to get 10 min. out of spoken IM and 1337 involving a group of kids and a old guys representing us, telling them off about how they speak. It was all very funny in a "had to be there" moment.
I ended up thinking that if language is used to convey ideas from one person to another, the "dumbing down" of english could also be looked at as stream-lining, making more efficient or weeding out unnessesary parts. If what I say,write or type quickly and easily gets my idea to the recepient, does it matter how it looks or sounds as long as it gets the job done?
But if you go off on your own, more efficient language, who can you talk to but yourself? This is where standards come in. Language is evolving and new standards of how words are used and when are constanly changing. It seems every generation has its new uses for older words, new words and words that are no longer used. With every new set there are those who get left behind, they mainly converse with those who speak like them and so too, the new gen. does the same, although both sides can still talk to each other.
I will not even try to come to a conclusion of the older ways are better, or is the new way making us dumber. Consider english from 200 or 400 years ago, I bet our well written engish looks dumb to the writers of the past.
As a side note, I remember reading this somewhere online about punctuation use in chat, consider:
"She had a crack baby."
"She had a crack, baby."
In the end who is to say this or that way of using a living language is right or wrong, if you do not understand what everyone else in the room is saying maybe your are the one who is wrong.
NOTE:
My bad on any spelling, grammar errors.