Coolant Leaking problems of the 2014 Audi A8

2014 Audi A8 vehicle has 57534 miles on it, a well maintained vehicle by Audi dealerships. When passing a vehicle on a 2 lane hwy the performance seemed to be compromised. Heard a gurgling like sound. The epc light came on. Pulled vehicle over to a safe location and vehicle would not restart. Dealership diagnosed turbo's blown and engine contains metal causing total engine failure. Our concern is if the engine would have seized up when passing another vehicle there is a real possibility that an accident could occur. There are a few technical service bulletins concerning this turbo issue, one in February 2017 and a production solution to the oil supply lines came in may 2018. What about all the vehicles that are out there still on the roads not under warranty and owners have no idea this issue exists? it seems to be a problem with the 4. 0l engines. Turbo's. "audizine" website did a forum poll titled 4. 0tt blown turbo poll. There is also a issue with coolant leakage on the turbo's that can cause damage per technical service bulletin may 2017. I am hoping for a recall before an injury occurs.