Couldn't upvote this more.
I am fed up with posts telling me email is broken and a new disruptive tech will be the cure. Email is an open protocol, decentralized, providing optional security.
Shortcomings—or rather call them additional requirements—can be solved with tools keeping email focussed on async text-based communication. Want to send large files? Dropbox. Want more automation? Improve the client side and/or write scripts. Want less spam? Don't distribute your address or sign-up everywhere.
If you don't like your inbox being a todo-list you should change something—maybe your job, profession or your work environment but it's definitely not email. I have got rarely todos in my inbox.
For me, email is—if you mind a set of rules—an efficient way of communication which is documented. You can easily and asynchronously discuss and agree on topics in a transparent manner with one or more participants, again: with an open and decentralized technology, no middleman anywhere. Sometimes obviously it's better to meet folks face to face.
Now tell me, which tool can do this? What do you want to improve?
This whole email is broken thing is just done for the sake of getting attention, making a lame conference presentation "disruptive" or getting some crappy todo app funded.