Widebody Order Gaps

A lot has been written in the past about the orders that Airbus and Boeing need for the A330ceo and the B777 (non-X) to fill the production lines until the A330neo and the B777X will take over full production.
I started to collect the backlogs for both aircraft every month to see how the backlog will change over time. With the current or announced future production rates I can then calculate how many orders both aircraft will need.
Of course there are some open questions that will influence the number orders needed to fill the so-called gap:

• How will production rates change until the new aircraft will enter service

A320neo vs. B737MAX market share

At last week's PNAA conference there was one more time the may be never-ending discussion about how Airbus and Boeing will split their market share in the narrowbody market (there is no talk about how Bombardier will be doing with the CSeries, but this is would be a complete different - and at the moment quite sad - story).
This discussion was initiated by Richard Aboulafia, who predicted a 60% market share for the A320neo. Boeing's VP Marketing Randy Tinseth soon dismissed that, saying that he believes Boeing will have a 50% market share with the B737MAX (and he would do a bad job if he would not do so, of course).