Interesting that you mentioned Mohammad Hasnain. I have doubt about the future of his career, as he was reported for suspect bowling action. He managed to clear his action later and right now is representing Worcestershire in England county cricket. Haris Rauf is a good bowler, but I would rate Hasan Ali ahead of him. Anyway, there is no shortage of fast bowling talent in Pakistan. New players are emerging, such as Shahnawaz Dahani, Mohammad Wasim (North Waziristan), Zaman Khan (Mirpur) and Mohammad Imran (Swat).
There is no doubt Pakistan is historically land of fast bowlers, and they produced one of the best in this field with too many achievements and having good speed and in swing and out swings as well, but sadly they never have any good academy like we have in India MRF which is surely currently one of the best for producing pace bowlers in early years Dennis Lille was spending his time and giving instructions to bowlers for having better future and now Prasad is on duty with this which is now heaven for Indian pace attack with this now even we are just behind world-class fast bowlers but can compete with few countries like New Zealand and South Africa with now going to touch Australia and Pakistan in near future.
For me, its the biggest failure for them that they never work on this and PCB is also never done any good job for this even they can do much better with this specially suspect action issue can also settle here for many bowlers which could be extra bonus for them.