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You can already get a long way towards channels by using reactive extensions (E.G. http://pastebin.com/h1xteunX ) Some syntactic sugar a la await could be nice though.
Not sure if you're aware, but your Rx example has a few problems: 1.) In the StartSenders method, you're violating the Rx grammar by calling channel.OnNext concurrently. Wrap it on a lock statement. 2) In StartReceiver you're missing out messages the way you handle the channel. Replace the loop with a call to channel.Subscribe
I did not know either of those things! Thanks!