To put DPF replacement into context regarding cost, assuming you had to replace the DPF at 100,000 miles, that's 1 Pence per mile additional running costs. If you add up servicing and maintenance like brakes and filters, oil, tyres, that will be far more than £1000. Sure it's an added expense having the DPF but £1000 in say six years after purchase is hardly the end of the World.
Given the latest Intel CPU vulnerabilities that have come to light, I wonder what shocks electric car owners are in for down the line. Simple law of a mechanic states. "If it's got wheels or boobs it will cause you problems."