Dude this has been discussed with exhaustive repetition.
IMO, this is what will happen:
Boeing will make the 747Adv with little success, maybe 100-200 units, same with A350 and A380, don't get me wrong I think 800 A380's over 20 years is fantastic apart from their estimate of 1300...
Afterwards I think both companies will focus on long term projects as well as their 'children'; being all current seires of aircraft currently in production. That supposed pix of the highwing-widebody that Boeing had it's cross-section patented, might be again IMO, the 737-successor. It might be a STOL airliner which would be perfect for smaller fields with high density traffic that can't take more planes. Yeah the freq drops but it is cheaper than expanding the airport.
I sincerely hope the 80x80 meter box is upgraded within 20 years, it will be required, if not then the A38x will be the largest ever built within this century. IMO, research on either a sonic or a BWB variant will have matured, it will be the only way to combat capacity issues without screwing with square-cube.
I do not think commercial space flight will allow access for most business travelers within 40 years, but then I could be wrong, in fact let's assume I am. Time (or a smartass A.netter) will call it on me.
[Edited 2005-02-19 22:37:56]
[Edited 2005-02-19 22:39:21]
The meaning of life is curiosity; we were put on this planet to explore opportunities.