Return to inbox on no reply (or Boomerang integration)

I would like a mail to return to my inbox if nobody replied to it in a set period of time. Or be able to have Boomerang do it for me. www.boomerang,com. Is this possible in the current product or is this on the horizon? 

The new version 8, due in the Spring, has a feature to watch for replies to messages you have sent.