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No cellphone access, and preferably no in-seat phone-type thing
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2-3-2 seating would be excellent, but I also doubt they would lose that much revenue.
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Something for the elites! Bulkhead separated cabin, a little extra seat pitch/width/recline, something.
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better lumbar support -- dunno if this is a Boeing thing or something that can be configured by NW or aftermarket
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errata:
footrests, personal airvents, LED reading lights as opposed to halogen/incandecent/fluorescent. Pick up an LED flashlight sometime. They're cheap, and I think you'll like the light quality a lot better.
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Glad to hear that AVOD will be wireless. That should free up some precious legroom. Overhead bins are fine, IMO. I think people carry-on too much as it is, or they overpack.
Besides, I think that might be something that Boeing can't change.