Every email between Gmail users should autoconvert to a Google Doc wherein replies are suggested edits or sidebar annotations/comments.
If you want to add someone to a "thread" you just share the doc with them.
Ian Brown @igb
Would make it easier to join an ongoing conversation without having to consume each incremental diff in sequence like most email threads.
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Also helps prevents isolated conversational branches from spawning.
It's not quite "just use a Google Doc" for everything, as you still want it to be more of a conversation...
...or at least a series of reactions to a message.
I don't think @SlackHQ really does this...even with files as conversational anchors. Also managing multiple chats/threads is still too hard.