Nx NW,
I think MEM/Tokyo could definitely become reality.
Though ANYTHING is possible, I don't see Big RED returning to JFK/NRT, because BK or NO BK, NWA pulled that flight for reasons that made sense to only them, AND that was before AA started flying the route with 3 class service with a 777.
We'll see. You should know by now that NW does not fly routes "just to fly them" they fly routes to make money. If you honestly think a small First Class cabin can carry a trans Pacific flight, you don't know the Pacific. The 787 is ideal for NY-NRT with oil above $40. The 777 isn't much better than the 400 on that route economically, with oil at $50-100 dollars a barrel. Just because you fly it, doesn't mean it's profitable.
PRE 9/11, Delta with an MD-11, NW with a 744 and UA with a 777 flew for our side from JFK to NRT. The Japanesse has ANA and JL each with one daily 744( JAL had days with 2 flights). AA only started after DL & NW pulled out. UA moved to IAD to NRT in 2006. AA had the foresight to pick up DL's LAX and JFK to NRT routes, today they are looking very smart.