It's interesting to read arguments about ditching in the ocean (at night).
BUT, if you watch the FAA video about laptop fires and you understand the fireextinguishing process in a cargohold then you will quickly realise the efforts are futile.
It is evident from the video that the batteries need sustained cooling to avoid another fire due to thermal runaway.
Th extinguisher will put the fire out, but doesn't cool the pack. The same goes for depressurising the hull, if you are high enough it might put out the intial fire, but doesn't cool the batteriepacks, resulting in a secundary fire, as these fires appear to be fully dependent on thermal runaway it is the fairly safe to assume the batteriepacks of the same type in the direct vicinity of the fire will also ignite, thus resulting in a chain reaction and a subsequent uncontrollable fire.
It leaves only two possible options open to avoid repeats in the future,
1. ban said cargo from aircraft and in addition restrict appliances on
passenger aircraft(the latter is virtually impossible, think laptop, phones
2. In order to give aircrew a way out, either retrofit with ejectorseats or
provide a means that aircrew can bail out if it comes to the worst.
For example the escapeshute as fitted to concorde protypes.