How many seats do you think a CX 748i could fit in a 4 class config? Initial guesses put this to around 355 seats (F9/J54/Y+40/Y252) with standard configuration, i.e. current F, Cirrus J, 42" Y+, 32" Y.
This, along with other factors (economics, etc.), will decide whether CX buys the 748i. Hopefully, CX will buy this wonderful looking bird (but that's not the most important thing for the beancounters...
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FYI, the current CX 74A (Olympus 744) seats 379 (F9/J46/Y324).