Originally Posted by
Maninthebar
For as long as manual trim is referenced as a risk management tool in memory items, QRH, checklists, manuals or ADs then it will need to be useable by flight crew.
Either it is necessary or it is not
Maybe they plan to address it indirectly through the "Improved crew procedures (and associated training)" part of the proposed solutions. For example by re-including the "roller-coaster" technique in the training materials. Of course that wouldn't be ideal, since you need to have enough altitude to use that technique.
Any solution involving hardware changes to the stabilizer trim system would open the "What about the NG?" can of worms, and I'm guessing Boeing would prefer to avoid that.