No canards or FBW or anything that drastic. The latest upgrades are engine and avionics only: 2 MFD cockpit, upgraded slot array radar with PL-12 support, and Kunlun engines which are more powerful, more reliable and economical compared to WP-13 engines. The upgrades are either in the new airframe J-8F variant, or MLU upgrades on the J-8D and J-8H variants. Many earlier J-8B were upgraded to the J-8D level before.
The J-8s still include the J-8Es and JZ-8s recon planes. Surprisingly many of the first generation J-8s are around, now upgraded to the J-8E which can use the PL-8 missile.
The design may be old and not too agile, but it is strong and flexible. The large radar nose has plenty of room for avionics, allowing suites of modern radars and sensors. The structure has been toughened and constantly improved throughout the years so it can still carry a decent payload.
Basically the program is now in a shoestring budget. The conversions to J-8H and J-8F is very slow, so far only one regiment has converted to J-8F and 2 regiments to J-8H, but even in the last part, it's mixed with upgraded J-8Ds. Seems more like MLU upgrades are being done on the existing fleet. After this I believe that the program is basically allowed to die out, although some few more J-8Fs are built. The regiments will be eventually converted to J-10/J-11, and the planes moved to backwater units still equip with J-7B.
Likewise, J-7G conversions also seem few. The regiments with J-7E will slowly convert to J-10/11, then the J-7Es passed on to backwater units still with J-7B.
J-6s no longer appear to be in service, though many airfields still has JJ-6s and JJ-5s (trainer versions).
My estimated conversion rate is one J-11 and two J-10 regiments per year, and 3 regiments being converted to JH-7A or H-6H (3 fighter regiments and 3 bomber regiments). Despite the two seater Q-5s and the Q-5 versions that could use LGBs, I think the Q-5s are also headed the retirement way. I expect to see a new J-11 regiment and one or two JH-7A regiments this year, in addition to two new J-10 regiments, which we have recently forming in the 2nd Division at Guanxi and the 3rd Division at Wuhu.