JF17B as a LIFT/fighter conversion platform or not. May be this issue can be studied in a more scientific manner, where the adaptation process of the young grads can be quantitatively analyzed. The outcome would not only lead to a better decision but could also lead to some potential improvements in the training regime followed at the PFT/BFT.
The current ACM had hinted at using the JF-17B as LIFT in 2015, but as of late, it seems the PAF leadership switched to FT-7s as LIFT/FCU (implying the JF-17B will be OCU).
However, the FT-7 is a fleeting platform as it too is aging (or has aged). Ultimately, I think they're just deferring the LIFT question for a time when there's more funding and fewer priorities.
That said, there are some valid rationalizations. First, I can't see them ever acquiring the T-50 or anything close in size, performance and operating costs to the JF-17. The T-50, L-15, Yak-130 and M-346 are all light fighters that are very close to the JF-17 (e.g. T-50) or with potentially overlapping cost issues and capabilities (e.g. M-346).
It is the Hawk 127, L-159 and Freedom Trainer-like platforms that are interesting. They're effectively between the K-8 and JF-17, but leaning more towards the K-8 in terms of size and power. Yet they are still markedly different, as we've seen with the Hawk 127/AJT's performance. So there is a genuine jump from the K-8, but it isn't overlapping with the JF-17.
Between them, the Hawk 127 is a relatively costly but rock-solid, mature and venerable option. The ACM also said stuff about wanting to work with Turkey on the next-gen fighter, which implies TFX, which in turn means that AHQ will need to talk to London. A Hawk AJT purchase can be a way to build a bridge with BAE. It's costly, but not costly in the sense of an albatross, but rather a nice power tool - it costs money, but it gets the job done, well.
The L-159 has just returned to production. It remains to be seen how well Aero Vodochody will manage controlling the cost since it has basically revived a shuttered production line - no small feat. However, the L-159 promises to be cheaper than the Hawk, and probably easier to acquire seeing that the Czech gov't is positive about defence ties with Pakistan. But then again, on/off production is an issue of concern from a longevity standpoint.
The Turkish Freedom Trainer is in development, but its entry as a factor could coincide with the day the FT-7P and FT-7PG have to be retired (for age). Pakistan is also opening a few major fronts with the Turkish industry, so if the performance is up to point (the Turks will replace their T-38s with the Freedom), then perhaps?