Actually let me change my 777-200LR prediction. It's now Boeing's to win or lose on price. SQ
is doing so much damage to the premium market out of LAX
and New York with its A345s it probably doesn't care to much.
Even if it only makes $100 per seat on those routes, it costs its competitors up to $X thousands for every passenger they loose, multipled by the frequency with which they loose them over a year.
So it has been a pretty good investment. On the other hand the Worldliner would fit well on those routes, may carry just over 200 passengers instead of 181 and bridge the years until central fuel tanks and higher rated engines and structure achieve a similar range in the A380.
Or a better answer comes from Boeing. It's a long call, and other things in this world can totally stuff up the industry well before then anyhow, like oil, war, depression and the usual mechanisms of large scale adjustment that afflict the human story.