As long as Pak-China-Russian relations stay the course, I dont expect any changes on the engine front. It would remain RD-93, and the most one could expect is a more powerful derivative of RD-93.
Having said this, I would love if chinese go ahead and pursue WS-13. Considering the fact that FC-1/JF-17 was born out of sanctions, its dependence on a Russian engine is not good.
As for a western engine, I have argued again & again that something of this sort is unlikely to be economically feasible. Western engines are way more expensive, even if ignores the greater risk of sanctions. The whole point of JF-17 project was to develop a cost effective fighter to replace the older fighters in PAF. Right now PAF plans to replace its older A-5/F-7/Mirages on almost 1:1 basis (if 250 odd units are purchased). Its not just the quality, but quantity as well which is important for PAF, and that's why JF-17 has to remain cheap enough. JF-17 is a multirole platform that would replace air-defence or ground attack or CAS dedicated fighters. Having 250 units (JF-17) all of which can do air defence (with BVR), ground attack, CAS, Anti shipping etc. would increase PAF capabilities manifold. You add a western engine, western avionics, composites and what not, and the price of the fighter would sky rocket, and the whole concept of having a cost effective fighter to replace the older fighters in PAF goes woooosh. If that's what PAF wanted, they could have gone for something like Gripen or may be more F-16s...100 odd units. But such a solution would not have given them the required quantity which they need alongside the quality.