The mass production of J10B is inevitable due to the immediate retirment of old J7s. I doubt PLAAF would be able to afford using twin-engined J11 to replace those hundreds of light fighters. One may argue the alternative of down-sizing the fleet, yet the plan won't go far for a country the size of china, -10% in a decade tops?
I bet J10 & J11 will go 1:1 ratio in the combine fleet of PLAAF & PLANAF, not just as the combination of high-low costs, but that of air-superiority & multiple-role.
what about the j-xx?