Having designed the plane to be a "drop-in replacement" for a 737 and having failed at that, it seems like there's no path forward, neither more jury rigging no

Having designed the plane to be a "drop-in replacement" for a 737 and having failed at that, it seems like there's no path forward, neither more jury rigging nor certification as something else - because to make the thing like 737, they made it not like a contemporary aircraft (paper manuals is the big example). Boeing have essentially painted themselves into a very costly corner. The FAA or congress could do a "certify it just for Boeing" action and the plane might even, maybe be safe then. But how many airline customers would want to fly in it?