China would probably like to retire all its Q-5s and replace them with JH-7s - presumably by then they won't have to rely on Rolls-Royce's Spey engines to build more JH-7s. They would definetly retire the older J-7s and J-6s, but I can imagine the PLAAF would want to keep its J-7E/Gs. They would be useful as homeland interceptors, since they have a higher preformance than the older models. While the high-tech aircraft fight an air superiority war overseas, the older J-8IIIs and J-7E/Gs would serve as interceptors in Mainland China. Other than that, your prediction seems likely.