Make it so , but the odds are ever increasing due to the large numbers of shells or rockets being fired , you simply cant field the x number of Iron Dome system for x number of threats , it is more likely that the system will be overwhelmed by the number of hundreds of credible threats alone increasing the probability of the target being destroyed ,
you are again using the flawed assumption of that Pakistan Army functions the same as insurgents , besides the Iron Dome is known for difficulty in intercepting hostiles which have a short distance and flight envelope in Israel which is again low in our scenario ... I know , that system will start to make more sense if its inducted to protect only " high value targets " but still it doesn't change the fact that the cost will be astronomically high making it unfeasible ... and still the five shells which may be used for a target like you hypothesized will be still cheaper than $90,000 interceptor missile !
P.S Tell you what ... Some fanboys here want to engage each and every incoming to protect troops too with Iron Dome besides those that might hit a high value target !