A nation with $ 19 billion in her savings account, for national security purposes, can spend $ 2 billion tomorrow and get stuff on cash. The only thing like I've said many times is, Pakistan is being smart about it. She doesn't want to tick off the WB and the IMF (both of which have a lot of Indian influence).
So if Pakistan can push ahead making economic progress for two more years, by the end of 2017, part of the CPEC would be functional, electric issue would be resolved, the country would be sitting around $ 30 billion cash, so middle finger for the IMF. It can secure loans directly from the manufacturing country for anything due to loan to cash ratio.
This is where both Shariffs are playing great together. Bad Cop (Gen. Raheel) and Good Cop (NS) when it comes to India. Gen. Raheel will issue a strong war-like message to keep Indian in reality check, the next week, NS will send MANGOS to keep their leadership calm. This is perfect aggressive-passive diplomacy and it works. Tells the Indians to remain at bay and at the same time, with a smile, it says "we don't want war, here, have some Mangos". All this is buying time for 2 more years. Then, India won't be issuing these silly statements, knowing there are over 400 4th gen jets to intercept whatever they have to send. Just like the Cold Feet doctrine has seen its end, and just like the "Naval Blockade" has seen its end.
So in the next 2+ years, you'll see a bump in the defense spending. By 2018, the defense budget of Pakistan will be around $ 12-14 billion. And heavies would come, the JFT's will be further advanced to block III.
In the current scenario, the JFT fires a BVR missile from JUST as much distance as the SU-30 and the Mirage 2000 or the F-16 would, in the Indo-Pak scenario. So majority of the work is going to be depending upon missiles. In dog fight, JFT can take on all Indian strike platforms but SU-30 and Rafale (when it comes). The -16 can take on the SU-30 and Rafale. Starting 2018, you'll see orders on the table for more assets and much modern at that. You just have to wait.
Like i said, the Pakistan running on little budget till the 2010,isn't the Pakistan now, sure isn't the Pakistan of 2018. A faster growing economy with a potential to be the top11th economy in years to come, requires a much stronger defense. Now there is money, and only time required for two more years to establish the system, strengthen it and get a few big project live or parts of those, live.
A LOT of new stuff is coming to Pakistan's all three forces. Just watch how it unfolds by 2018!!