I know that the MAIN reason Boeing and Airbus are held back on this is the development costs. It costs a lot to even develop a slightly new design, let alone mass manufacturing it. But that's the thing: the plane needs to be manufacturable before anything else. Also, the two persisting problems associated with BWBs (cabin pressurization and low-speed control) must be solved. What are the other things that will need to be done to make this a reality? I'm starting to get bored of the classic TAW.
My question is different in the sense that it asks for ways to actually make it happen, as I'm a firm believer that it can be done.