What's more, not everybody follows etiquette:
- reply and just keep the original message at the bottom
- reply in between the original message
- reply at the bottom with the original message on top
- Some mix quotes and then reply to some parts in the original
And then how do you link to users or messages from your email client?
Plus who wants to have 5 different email accounts for 5 different mailing-lists? And why would I respond in a manner that allows the world to see my private email address?
I heavily disagree that emails are the way forward in this regard (maybe even in any regard).