It's like the Super-7. What were the chances of it ever seeing the light of day had it not been for the PAF selecting it for its own use? The PAF's next-generation fighter could be from those other Chinese designs.
While the FC-31 has come along, it's worth remembering that the PAF hasn't worked with Shenyang since the J-6 days, its comfort-zone is with Chengdu via the F-7P, F-7PG, JF-17 and, for a time, FC-20. The PAF could try working with CAC to come up with another next-generation fighter platform.
This doesn't contradict ACM Sohail Aman's call for supply-side independence either. This time around a higher proportion of the development work and manufacturing process could take place at PAC, much in the same vein as BAE Systems will be at TAI to work on the TFX.