You guys are missing the big picture by just a smidge. The pieces are all there, we just have to put them together.
The 700 QC (quick change), currently flown by the Navy, is not certified for civilian use. The market is to small for Boeing to pay for it. That certification process makes it to expensive for us to pay for it. Therefore, we will not be getting a 700 QC - ever.
Now a combi? That is a different story. The FAA can't stop it, but they may not make it easy either. The main thing that the FAA hates is a moveable smoke barrier as in the QC. A fixed wall / smoke barrier as in a combi is something they are more comfy with. A straight freighter they are happy with because at most you will only kill two pilots and maybe a handfull of people on the ground.
So, BT has publicly stated that they will start with 5 or more Horizon Q400's in ANC to do some of the flying in State. The time line has not been publicaly stated, but the 737-400 fleet, and most important 737-400 combi / freighter fleet, is scheduled to be retired no later than 2016. So there is your time line.
The Q400 can not run around the State, full of pax plus 3 bags per pax. This brings up the concept of a Q400 combi? But lets not go there now... So if a big chunk of the Arctic is being flown by a turbo prop that can't haul all the bags and freight, then it makes sense to have a couple of 737-700's running around the State on a daily freight run.
I believe this is part of the reason they painted Eskimo's on the Q400's. Soon they will be running around in State, so it had to "look" the same.
I think there will be a Horizon base in ANC by next summer. They will need a couple of years to work the bugs out before we hand it all over to them. The Horizon ANC base will grow. The Alaska ANC base will shrink. The Alaska pilots will find themselves in SEA or PDX flying ETOPS. The Horizon pilots will find themselves in OTZ trying to re-learn how to land on the 500 foot mark firmly, not the 1500 mark - looking for a greaser on that unbearably stiff Q400 gear.