Interested, would you want gmail to do anything additional? Aside from a modernised look every now and then, I can't see that there's many additional features you might give an email client?
If you have the resources of Google available to you, I'd think something could be done to make email as a whole less bad. I get so many emails that inbox zero is NOT at all realistic. You could argue that's not Google's responsibility, and you'd be right, but it means I use Gmail less, which is at odds with me using it more and Google getting more of my attention.
