That'd be nice, but I won't hold my breath.
The Kansai Int't (KIX) landing fees are much lower now... to the point where they have a new discount carrier, Peach (discount airlines being new for Japan).
I think there's a couple of reasons KIX isn't used as much. It's become a less important transfer hub, Incheon successfully siphoned a lot of traffic from Japan in general in recent years. In addition, they still can't decide which airport to use... and some will want to fly direct to Kobe or Itami anyhow, which would make more sense to transfer in Tokyo. KIX SHOULD've built like it was planned, between Kobe and Osaka. It would've a whole lot easier to close Itami and not bleed money. But hey... it's Japan... king of pork barrel projects and overbuilt infastructure.
Haneda's expansion was in order to compete with Seoul's Incheon. I think Tokyo always thought it would be the "London" of Asia. So, I think for the foreseeable future, the focus will be Asian and some NA business travelers to Haneda, and keep Narita for most flights.
As for Narita, yea it's far. The Sky ACCESS Line
just opened and it's still 36-44 minutes from the North-Eastern edge of Central Tokyo... and that's at 160km/h. Pity the landing slots are so bad on the incoming flight. Arriving at 10:30 at night isn't the greatest. The return was nice, though. Leaving in the evening was nice if you can get sleep on the plane.
If I'm going to fly out of Seattle, I'd take Delta and fly direct to KIX(Osaka) unless I have plans to stop in Tokyo.