Agree with previous poster. Unless govt comes to the party with mandates or subsidies on battery replacement this will probably be a niche market for a long time. When batteries become cheaper (eventually), newer used cars will be more attractive and the old Leafs (8y+) will be written off quickly in my opinion.
I might still be a niche market customer myself being a reasonably early adopter of a 2016 30kW Leaf and not wanting to contribute to wasting even more than we already do with gas powered cars by reducing life cycle of electric car significantly. So following developments with interest surely. In my case a more cost effective 40kW replacement might also be adequate.