And all the world shall see Him?
Just a quick thought. When it says in The Revelation that all would see the return of Jesus, what does that mean? Many Christians (including myself years ago when I was part of the "Jesus will be back by 1986" crowd) tried to put a technical spin on it by saying that we would all witness it via satellite or some other future invention - like the internet. After all, the Earth is a sphere and if Jesus shows up one on side, those on the other side would be hard-pressed to see Him unless they had some special device for doing so.
But how about this? (And be nice; I'm opening up here.) Perhaps Jesus in all His glory will reveal Himself as the transcendent Being He is. Perhaps He will open up dimensions of time and space that we don't have access to now. Meaning, where He is He could reveal Himself all over the world from his lofty extradimensionality at the same moment in time. Literally every seeing person on Earth could see Him return, spherical Earth or not.
Draw a bunch of stick figures on a piece of paper. Their universe, the sheet of paper, is flat and they can't see every other stick figure on the paper. Other people are in the way. How could you reveal yourself to all of them so nobody and nothing was in the way? Where is a place where everyone could see you at once? Above the paper. Allow them to see you in the third dimension above their two dimensional world and ba da bing! you have yourself everyone's full attention at once.
I said don't laugh! For those of you not familiar with extradimensions and all the strange but very possible things that can be done there, read our Fishguts and Extra Dimensions (http://www.swordandspirit.com/LIBRARY/texts/fishguts.php), or the book Beyond the Cosmos.