While I agree that CFM CAN
produce an engine, there's no evidence to suggest that they WILL produce one.
Even if they are to produce one, they still have to have it certified. A year process after the first one flies.
It would need a 33,000 pound variant much like the -5B3 to be competitive with the fuel and cargo uplift.
That bigger first stage fan is a big deal... there's hardly ground clearance for it on the 739. The -7 is also the penultimate of technology from the -5B and -5C. It will not be instantaneous to produce.