Can you expand on this? I agree with your premise that email clients should be getting smarter and simpler (or at least I accept that as a valid premise). Really, though, how do you plan to make money? How do we know this won't disappear/be no longer supported in six months or a year when you get tired of not having any revenue?
I believe a vastly better email platform has inherent value, just like a vastly better travel planning system has inherent value. Look at the dozens of ways companies are currently earning their keep in the email sector. It's not the same as Twitter or Facebook, which only have usability value to consumers, and which can only succeed at massive scale.
Which is, not-so-coincidentally, why my next project is 100% open source.