Earlier quoted context omitted.
I think email needs to be changed from top to bottom, but offering speed alone would be a hard sell to launch with. You can get the Microsoft offering (Exchange Online or packaged with Office 365) starting at $5 a user. Microsoft can afford to spend money on it. I've used it and it is a lot faster than GMail (although it wasn't enough for me to switch).
One thing I noticed is that email is a problem for "important" people who receive tons of messages per day. They must read/answer that one vital email right away. Kevin Rose talked about this a few years ago, and I've heard many high-profile investors complaining about this. For the vast majority of the people on the planet, GMail is just good enough. Yahoo Mail and Hotmail are still doing well. Perhaps email is perc…
It is, but only in terms of what we think of email in today's usage. I think the next step will be where you can make the messages dynamic which would basically allow you to receive/deliver an interface to an app. Of course with all that power comes the issue of how to control it, but that would be an interesting problem to solve. Imagine instead of getting a notification email for an update on a Basecamp todo list, you would see the actual todo list and could manage right from your inbox.