I think the issue the Rev is trying to address is one of laziness, not language. I’ve already noticed people tend to write things to me in emails that they wouldn’t write in personal letters. I don’t know why this is, but when it comes to electronic messaging people begin to feel taking the time to write “properly” isn’t necessary anymore. For people who don’t have language skills, I’ll agree that they shouldn’t be held up to as high a standard as those who do. However, for people who do possess the skills and simply don’t take the time to use them, this can easily lead to the use of “lazy” language in other, non-electronic mediums.

While I understand your argument that this is simply language evolution, I don’t agree. Though some grammar rules seem useless, there are others that exist for very good reasons: to bring clarity to what you say. Certainly spelling is one of these, and I can say that by practicing good spelling in everything I write (electronic or not) my spelling has definitely improved. Still, spelling is often ignored in electronic messaging and it is no great stretch to see how this “laziness” can impact communication in other mediums.