I think we need the ability to send very large files to be built into the email protocol. It doesn't have to be directly as an attachment, but it does need to be seamless and familiar. Our email programs can send the file another way and sort of pretend it's an attachment, and nobody will have to think about it again.
Mokalus of Borg
PS - These days, the email definition of a "large" attachment is pretty limiting.
PPS - Hence the need for a new way of sending attachments.