The inhibition has generally been cost, and with limited resources, the PAF preferred new fighters.
However, unlike prior decades, the PAF now has a low-cost fighter that can drive new technology and capability inductions (e.g. JF-17 Block 3 and AESA radars). So, it could have a bit more room to look at SAMs. But since these are also costly, especially if you're trying to go for full coverage, I think it ought to pursue a domestic program or joint-venture.
To me, the South Africans are a solid bet via the Marlin, Umkhonto, and Cheetah series.
We can co-develop those solutions and then induct them gradually via blocks. Unfortunately, both the Army and Air Force fast tracked their SAMs, I think we spent nearly a $1bn on HQ-16 and Spadas, i.e. SARH based SAMs. And I think the Navy will spend $250 or so on its SAMs.
I wish we had actually earmarked $500 m for joint development and tried generating savings via localized production of the Umkhonto (and, later Marlin SAM).
That aside, we haven't settled on a long-range SAM (at least the PAF hasn't). I hope (with Azm and all) it looks at partnering with Turkey on the Hisar-U or SIPER rather than import something.
OTOH, the HQ-9 might be a natural fit for the Army as it's really familiar with Chinese SAMs, and I assume the HQ-9 will interoperate with the HQ-16 well.
But the PAF should think clean sheet, perhaps a next gen replacement for the Spada post-2030, and working with South Africa and/or Turkey is the way forward. Heck, maybe Ukraine too.