Seems to me that, given the lack of a root cause and Boeing being in a rush to get the aircraft back flying, the proposal submitted utterly fails to address the real problem and is focusing on containment only. In other words, they're not going to fix the root cause.
Don't know about you, but that doesn't wash with me, and I hope the FAA will tell them to bugger off back to the drawing board and design a battery system that's no more liable to combustion then NiCad's.