The average car on UK roads is just eight years old.
Well 8.4 years old, back in 2021. But obviously that means there are many millions of much older (and much newer) cars on the roads.
Cars are scrapped because of the need for panel repair, general repair, servicing and tyres, not because of their drivetrain.
Historically perhaps, because major drivetrain failures were (a) rare and (b) not necessarily ruinously expensive to resolve if they did happen. Which may well not be the case with older EVs.
A bump to either of your cars will result in an automatic insurance write off.
But not necessarily in them being scrapped.