J-10Cs are indeed excellent combat aircraft, no doubt about it. However, one has to take into consideration that an air force establishes it's war-fighting doctrine based on the competence of its fighter-pilots and the platforms they use. Pakistan Air Force fighter-pilots have 30 years plus of combat experience on the F-16 Fighting Falcons. This forms a significant part of PAF's combat doctrine. Any air force in the world does establish the nucleus of its war-fighting capabilities, around specific aircraft. It's true for USAF, RuAF or PLAAF. And so Pakistan Air Force is no exception to this approach. Therefore it is only logical to assess that Pakistan Air Force will evolve it's doctrine as time progresses and new combat aircraft are inducted into it's fleet.
Take a look at the Turkish, or Israeli or British air forces. There is one or two core aircraft around which these air forces form their war-fighting capabilities. For the Turks its the F-16s and F-4s, Israelis it's the F-16s and F-15s, Brits have Eurofighters and Tornados. So it's important to have a core within the air force. For PLAAF it is J-11s and J-10s. You see where I am going with this?!
Pakistan Air Force will continue to concentrate on the JF-17 Thunders. As this aircraft will be the mainstay for the foreseeable future. As Block-lll arrives, greater capabilities will be available to Pakistan Air Force's fighter pilots. As many are aware, AESAs, HMDs, HOBS, IRST, Adv-EWS and CFTs are some of the capabilities that will form part of future Blocks for JF-17 Thunders. This would be the combat aircraft that Pakistan Air Force will use effectively in the future. Since it is a "Multi-Role" combat aircraft, that would be it's primary role. Hence it is safe to presume that Pakistan Air Force would concentrate on developing the aircraft and it's war-fighting doctrine around it. This will take time, and as years pass by, once JF-17 production line completes it's stipulated order of 250-300 Thunders. By then, Pakistan Air Force would have already began induction of an Air-Superiority combat aircraft.
One last thing, whichever Air-Superiority combat aircraft that Pakistan Air Force selects. You can be sure that they will establish a full-spectrum maintenance and logistical support for it. I'm not talking the usual essential basic support, rather a comprehensive one. And if the aircraft is J-10C, you can rest assured that Pakistan Air Force will build a complete infrastructure to support this aircraft's maximum serviceability.
5-7 years go by at warp speed these days, where time flies faster than an SR-71.