Although the PAF has been making great strides as of late, there remain some sectors in which there must be an improvement before the end of the decade. Time and time again, we see wishlists on these forums; some of them are outrageous, and others incomprehensible. But in my opinion, there is a very strong need for 3 'game changing' acquisitions and developments which are completely attainable and not out of reach (in terms of budget, politics etc.).
1.
The Original Option of 18 F-16 Block 52's
PAF must exercise its option to acquire the 18 F-16 Block 52's which were part of the original deal a few years ago. Because US congress already approved them, it would not be a matter of 'if', but rather a matter of 'when'. Also, considering that PAF has ample munitions (500+ AMRAAM C-5's, JDAM kits etc.) which are only compatible with the F-16, it would be the best option as far as adaptability and logistics are concerned.
In addition, the F-16 blk52, with the right combination of armament and equipment such as the AN/ALQ-211 EW Suite and Sniper pod (both of which PAF has) - in my opinion - is the most deadliest platform in the subcontinent.
2. Changes of JF-17 Block 2
On another note, before Pakistan keeps forcing the JF-17 down the throats of its potential customers, it should mature the platform and incorporate some of the basics which Air Forces around the world now look for.
As far as I'm concerned, PAF shed the light on the JF-17 too damn early. It should have only been introduced to defence exhibitions and major presentations around the world this year and once a good number of features which I have underlined above were implemented on to the aircraft. I have a very very strong feeling that these shortcomings are why China hasn't inducted this fighter in its fleet. The resume of this plane would have been much more convincing, powerful and dangerous once a super power had it actively deployed in its Air Force. Let's not forget that by successfully exporting this jet, both the air force, as well as the economy, have a lot to gain.
3. Long range SAM/Anti-ballistic missile defence.
While Pakistan employs a mix of Aspide-2000 and Crotale for air defence, PAF still does not have a long range surface to air missile platform. The viable option here is most probably the HQ-9/FD-2000, this system has also been selected recently by Turkey. Moreover, having such a capability can be a serious deterrent to any misadventures taken by the enemy.