Email in particular?
I agree wholeheartedly that text messaging is creating nations of stupid kids who can't spell. I've seen it all over the net, even on manufacturer's product pages and physical packaging (granted, products from Chinese companies, so I give them the benefit of the doubt due to translation). Words such as "u", "ur", "b4", "ne1", etc. I can't even read this crap.
But I take offense at this part: Expertise in text messaging and email in particular would appear to have affected spelling and punctuation."
What does email have to do with poor grammar, spelling, and punctuation? I've been emailing since around 1992 (before the Internet became popular), and I have no trouble. The blame is to rest on the text messaging industry, and the reason for it is very simple -- small screens, and small keys with multiple letters per key. With a full-size screen and full-size keyboard (such as email, unless you're emailing from your phone), there is no need for such substitutions.