Some things will still add up. Someone who might be shopping in the price range for a used car with 100,000 miles might also see a car with 200,000 miles that needs brakes (probably for the first time in an EV's life), shocks, bushings, CV joints, A/C service, or possibly corrosion repair/mitigation in some climates, might choose to trade or scrap over spending those repair costs.

Also there becomes a crossover point of residual value where a car involved in an accident becomes cheaper to total than to repair, which is probably what takes a lot of cars off the road.

That mileage may stretch longer if the important parts of an average EV drivetrain can run without major service for significantly longer than the average ICE drivetrain, which seems like a likely possibility.