Pakistan Leaders know once Iran is destroyed, It will be replaced with a Pro US, Pro Israel Iran that will be anti Russia, Anti China and Anti Pakistan.
The Effects will be:
-Russia and China Lose another ally in the mideast.
-China loses its belt and road route through Iran
-Iran will only sell its oil and gas in US dollars, hence russia and china will not be able to break the US dollar dominance
-US gains a new route into afghanistan through Iran, Pakistan will no longer be needed, they will be finally able to Sanction Pakistan
-Iranian Gas Pipeline will finally be built towards Europe, ending Russian energy dominance over europe, lowering Russia revenues hence weakening China strongest ally.
-Relationship between new pro US/Israel Iran and Pro US India will go towards alliance.
-Pakistan will be surrounded by 3 sides.
Iran isnt perfect, but a US puppet Iran will have disastrous Geopolitical consequences for China,Russia,Pakistan
And a positive impact for India US alliance against China and Pakistan
or we can turn Iran into another Afghanistan for US