Due to the horrific economics of the 345 it did not work out, but with the 777-200LR you will see airlines adding this sector very fast. Also keep in mind, that unlike ORD, JFK, LAX, MIA, SFO, BOS and EWR, DFW has NO direct service to S. Asia, SE Asia or Australia. Each of the above mentioned other airports already has a major (domestic or international) that has direct flights. Thus the first guys into DFW will basically have a monopoly.

What airline serves BOS taoASIA? NONE I am aware of. Korean Aier served BOS as a 1 stop through IAD and JFK for a while a long time ago. AA announced and loaded the res system a few years back BOS to NRT on the 77-200ER but never flew it as a non stop as they could not get the NRT slots. They did fly it as a one stop with an MD11 the rough SJC for a while about 10 years ago but then changed it to a change plane when the MD11's broke down.
The most not understood -Why CX or AA does not fly ORD to HKG. They both have the planes to do that route.