I suppose that was my point - the A380 has 4 engines and much more space than even a stretched 777 will have, so the idea of those two competing is a bit weird IMHO. But then I suppose airlines are looking more at cost per passenger per mile, and all that, and two engines are cheaper than four.
That's also why I mentioned the race for ETOPS bragging rights - "my ETOPS is bigger than yours!" - since I was wondering how much need there still is for 4 engines. The Great Circle Mapper lets you see the effect of ETOPS up to 330 min, and once you get past 180 minutes it only seems to matter if you're trying to cross the South Pacific e.g.
180 min up north vs
240 min down south. (Using the "777" glide speed settings of 410 kts.)