Again, the problem isnt with Okafor's size- it is Okafor's size COMBINED with West's. You just dont see championship frontline's that are 6'8, 6'8, 6'10. Look at all the title teams and elite teams in general.
I dont see West going anywhere soon but to win a title down the line some additional size will have to be added either with a replacement for West at the 4, moving Okafor to 4 or getting some kind of freak 6 11 SF like an Odom or Garnett 5 years ago type. Thats just what history says.