This might end up as non-issue because of economies of scale. In 10 years batteries might be so cheap that making replacement packs for older cars make sense

This might end up as non-issue because of economies of scale. In 10 years batteries might be so cheap that making replacement packs for older cars make sense. On the other hand, there's non-negligible possibility that cars powered by ICEs will be forbidden to enter city centers in 10 years.