250 aeroplanes in the fleet by 2018 as quoted by Tim Clark. 155 aeroplanes in the fleet now. Normal crewing between 8 to 10 crew per aircraft. Use 10 * 95 = 950; so the last 300 pilots already on the list (well more than that when you consider ex cadets further up the list will get the hours by 2018) have not got an upgrade from fleet growth until some time after 2018. As stated above, because of the upgrade policy this will hurt the current boeing FOs more than the current Bus Fos, as there are so many more Boeing FOs on the list than Bus FOs., and most new deliveries until then are on the Bus side.
So plan on at least 10yrs for an upgrade when joining. If it comes earlier that's a bonus.
The Don