teifi,
No aplogies necessary
Most of us already are MFF, and those who are not are gradually finding A320 renewals appearing on their rosters!
Even as it stands at the moment, there would not be enough 330 only drivers to enable a viable 330/340 MFF operation. Let alone the cost/complication of having over half the fleet MFF 320/330, and the rest 330/340....can you imagine the number of new memos and SOP's that would generate ?!