The argument over 2 versus 4 is nonsense! Ask TWA or Swissair or the DC10 at Sioux City.
The most likely cause of multiple engine failure is either something catastrophic or fuel contamination - in which case, it matters little as to how many engines you have. I have no figures to hand, but I bet over the years since ETOPS was introduced that 2 eng A/C have a better record on safety than their 4 eng brethern over ocean crossings. In any case RB has no professional experience regarding this topic. Like many on this thread, I suspect he is currently clutching at commercial straws.