The 1983 Boeing 767 Air Canada fuel exhaustion incident was not caused by pilot error.
Not to derail this thread too far, but technically the pilots contributed by dispatching without an operational FQIS - IIRC that violated the Master MEL. That being said, my co-workers at the time all agreed we'd fly anywhere with those pilots - they'll never make that mistake again, and once the error became apparent, they performed brilliantly.
But JammedStab's point is that if you takeoff with insufficient fuel to make your destination, you're going to have a problem regardless of the number of engines.
Don, regarding the 777X order book, before the 787 and A350, 300 orders for a wide body two years before first flight would be considered outstanding (and don't forget, a lot of those 787s were sold below cost
). Given that the 777X is basically sold out for the first few years after EIS, there is little reason to place an order now - better to wait and see how well it actually performs once it starts flying.