One word: No.
More words: Just because we don't have to be literate on the internet/cell phones doesn't mean we should go off and type liek retardz. I personally prefer being literate in any case, with the exception of emotes and SOME abbrieviations. Typing barely understandable words all the time usually means you're not very literate, or, in some cases, I suppose, too lazy. Which is inexcuseable, in my opinion.