I think we can produce another Amir but we may not get a replacement anytime soon as good as M.Asif. You rarely see bowlers in Pakistan to consistently bowl at one good area that is at good length and hitting wickets most of the time. The ability to seam the ball along with excellent line and length made him world class bowler even with low pace. Playing a seaming ball is more difficult to play than the swinging bowl that made him more dangerous. Its so unfortunate he got greedy and we lost such an asset. I wish Pakistan can get such a bowler again soon.