I think we have a replacement in the FN SCAR-H. Some SF units already use it like Scotty said. It comes down to if the Pentagon and bean counters want to go back to the 7.62.
Really liking my Mystery Ranch Metcalf. Carried my Sendro on the side just fine. Unfortunately didn't get to pack out an elk with it yet.
http://www.mysteryranch.com/metcalf-pack-ex
Very happy with RL-26 and the 200 ABs out of two different 30-06s. Didn't work so well with the 180 ABs. Couldn't get enough powder in the case to do much better. Thinking about trying some 220 and 240 SMKs just to see what happens.