POP SMTP etc extensions

Most non-technocrats have a lot of trouble envisioning technology that
doesn't yet exist. 

I wonder if anyone has seen a survey or random ordinary users of email and
what they find deficient?

I can think of things I'd like and think aren't cool, but well replumbing a
planet for me isn't really fair to the 1E9-1 other users!
Regs
Dan