Being a guy who repairs Volvos daily, I know all about ETMs and their failure rate however, in my real world experience, it's rare when one causes a total stall out during rush hour traffic or whilst crossing a RR track thus being a true safety issue. Most begin by first setting the CEL and might cause slight driveabilty problems first.
Since the car was first produced, there have always been many reasons why cars have driveabilty issues and stall. Cars with carbs, points/condensors, etc stalled too when something wasn't just right.
Don't get me wrong here, I think that the early ETMs are POSs and no, I wouldn't want to own a car with one nor wish to pay the big $$s required to replace one yet I'd be surprized if anyone will be able to force Volvo into a huge recall for these. Most ETMs fail with higher mileage, older cars that are out of the 4/50 factory warranty.