Of course they are. It’s the same process as applied to DSLRs, which depreciated much more quickly than film bodies did only a few years prior.

Film bodies found their post-digital price floor quite quickly. DSLRs and mirrorless have only found secondhand price stability in the last three or four years and while a big part of it is the quality plateau at the end of the megapixel race (which might have some sort of analogue in the electric car industry, though I don’t know what it is —- range, perhaps), part of that was driven by pandemic component scarcity and inflation holding up the new camera market prices.

In short I think this depreciation will last for another decade until manufacturers feel confident they will sell enough volume to make cheaper cars.