BM very good post.
Crew planners / Fleet Man's are saying all upgrades 3years 2 months by the end of 08( more then likely the 08- spring 09 plan on the portal). I think there is 240 upgrades planned until spring of 09 100 - 777 140 - 330 so I would not say 777 fo's are going to be much faster if they were to join now.