The issue of there only being two 7E7's is not a significant one. First of all there is no way they will go to Freedom. Freedom are a budget carrier who, like Virgin Blue Jet* etc, squeeze as many people into an aircraft because people are prepared to put up with this for short periods of time. Would any of you sit in cattle class a la Virgin blue for 15 hours? not bloody likely.
Second of all you also need to factor in the 42 options. At least some of these will end up being 7E7's. Air NZ I am sure were persuaded to be a launch customer for the a/c as Boeing probably wants to get the ball rolling a bit and you will possibly see a few more orders for the aircraft seeing another airline has now opted for the long range 7E7. The first 7E7's will go to ANA so it could possibly be 2009 before ANZ receives their first aircraft. By that point ANZ will have a much clearer view of how the aircraft will fit into their fleet.
Because of the cabin upgrade on the -400 they will remain in service until 2008 whereupon they are likely to be replaced by 777-300ER's. This is again where the options comes into play. If ANZ are operating 777's 747's 7E7's and 767's all at once it will only be for a very short period of time.
As for DEC's: again, not bloody likely!!!!!