Maybe. Depends on how you interpret the numbers. The electric Focus seems to command a premium of ~20% over the SE for a comparable used car near me, but the MSRP is >50% over the SE new. So you could see that as used buyers believing that the electric is worth 20% more than the comparable used IC, or you could see that as buyers believing that the a value of an electric drops much more rapidly than the value of an IC. Maybe after a couple more years these lines cross and the IC commands a premium. I honestly don't know.
If a new x kwh battery pack cost 10k then but a new xkwh battery pack is only 4k new today then predicted deprecation calculations should arguably be based on the 4k price not the 10k initial price unless you expect such dramatic price drops to continue.
In any case, I think the current used prices would be vastly lower if people expected the kind of range and lifetime limitations you get from not replacing the batteries.
Anyway, this might change if they are more common, but for now used electrics seem to have a significant price premium suggesting people think replacing older battery packs is probably a good long term deal.