To the one who says that nissan is in business of pushing metal:
A) Battery is mostly metal.
B) A low maintenance, reusable car is a marketing model for increasing sales and obtaining market dominance.
I truly believe that there will be up to 40kWh upgrades to all Leafs, because the form factor hasn't changed and Nissan has to support them for 10 more years. They aren't going to stock 50,000+ old battery packs to last 10 years. I can see them maybe stocking 5000 packs and then when they are about to use them up, reassessing and consider making more, especially if more people need them than they anticipated.
If Nisan sticks with the same 2P form factor for a while, they likely aren't going to give a replacement pack that only has 24kWh unless it is limited. You can't just take away capacity (volume) with higher energy dense cells unless the power density makes up for it. We are pretty much guaranteed a vastly better pack than the original with respect to longevity, it is the only thing that makes logical sense.
Nissan knows they owe it to us. Carl ghosn or whatever is friends with Elon and I'm sure he wouldn't let us down, right...? haha