Go with my drone wingman suggestion and that isn't a problem. Radar guidance can come from another platform.J-8II are useful for reconnaissance and can serve as decent BVR platforms. Later variants use the same radar as J-10A and can fire PL-12. J-7 on the other hand can only be used WVR.
I agree, it seems strange that the PLA would retire hundreds of jets with airframe time with no obvious replacement in such a short period.Not that I am aware of.
Also take the claim that all J-7s will retire with a grain of salt. It came from a CCTV expert, not the military directly.