Agree. But blaming Zia is an oversimplification which feeds off western sourced propaganda narratives. Zia was no angel but Pakistani penchants for nepotism and dynasticism is the real problem and the single most probable cause of our academic regression. It creates a dysfunctional spoiled brat of a society, with the most dysfunctional and most spoiled brats being given the keys to the city.
If the genuine intelligentsia has already fled from this land where foreign funded elites and their armoured SUVs operate above the law, then why would they come back now to help generate new military and civilian innovations? What motivation exists for a revival of those days you speak of?
As an example, Iran have maintained a truly high calibre scientific community as well as excellent literacy rates throughout society despite having an autocratic mode of governance. This must - at least partly - be because nepotism and its co-existing funneling of public funds into certain "clans" have been suppressed.