> keep making the app available

Leaving Pakistan means shutting down their Pakistani App Store, so the app still won't be available.

(Someone could, say, put the app on the US store and Pakistanis might be able to figure out a way to get it from there... but they can do that either way.)

> ...The alternatives are to have a different store for each country

OK, I guess you don't know this yet, but that's the way it is and has been the whole time. Different laws, different stores. We already aren't stuck with the intersection of what's allowed in 180 different jurisdictions.