Today Toyota announces its solution for the unintended acceleration issues in many of its cars. After hemming and hawing with all this bullshlit about floor mats and pedals, hopefully they will do the right thing and install new electronic drive by wire electronic accelerator modules in all these cars (a massive expense to be sure). It is very likely that is the cause of this tragic problem. But if that is the case, it makes you wonder how easy that is to diagnose and fix.
By the way, the 'floor mat' solution? One of the fatal crashes in Texas (Toyota Avalon) that killed four people? The floor mats were in the trunk. So that wouldn't appear to be valid.