From pure technological PoV I agree that even replaceing 60% of these might give us superior performance with say Block-IIIs but considering the regional balance of power requirements, PAF will be bound to maintain a healthy balance of power viz-a-viz IAF where number of sophisticated 4.5 gen fighters are to rise. No matter how advanced a fighter jet is, it can't be at two different places in a combat. Next IAF strike packages will be even bigger than 72. After May 2025 humiliation by PAF in skies, IAF will be desperate to have some kind of aerial victory over PAF and only way they know is to throw money at problem (which for IAF is far complex than receeding squardron strength) to get more fighters compelling PAF to restore balance of power.