We've been through this before: It wouldn't have helped.
Sure, it'd have fixed the fire problem for people who follow the rules. But it'd still be banned from commercial flights because there's no way in hell an airline will inspect the battery to ensure that it has been properly replaced and is of the correct vintage.
Furthermore, plenty of folks (myself included, because I'm daft like that) would have refused to return the old, too-big battery and kept it as a spare.
As much as I want easily-swapped batteries in all of my devices, it wouldn't have made much of a difference here.
Now that the smoke is clearing I may look into a fire-sale Note 7 just to futz with as a semi-pocketable tablet with a stylus.