Re: One day
One day, we'll have email clients that can be configured to ignore clicking on attachments, and ideally put up a message upon clicking saying that clicking on attachments is bad practice.
The web trains people to click on links without thinking about the possible consequences. Using the same user interface in an email client means that people are already trained to click on links, which in this case is a link to an attachment.
This is a UI/client behaviour failure just as much as a PEBKAC.