"But e-mail’s functionality has been devalued by unrelenting abuse in
the form of spam, viruses and phishing. We’ve even reached the point
where one must ask whether fed-up users are ready to declare "lights
out" on e-mail."
The "lights out" scenario she speaks of is clearly not likely to
happen, but it is interesting to note that as users become more
suspicious of email content, they are reporting more and more
legitimate email as spam. For more detail read her news.com
article, Is it ‘lights out’ for email?