Pakistan community has similar activity like Nigerian so I think it's possible to expect this change in near future, but let's see how much members from Pakistan really want this to happen.
I think that bolded part is the key. While Pakistan thread was/is very active, Nigerians have more high ranking active accounts that actually supported their cause. I am not saying that Pakistani members doesn't deserve their own local board (based on their numbers I think they do) but imho that might be the reason why Nigerians got it first. I always imagined that Pakistan and India speak same or similar language, but this is not the case, most Indians also speak very good english language.
Afaik their languages are similar and they both also have English as one of the official languages, but from what I noticed while making those monthly overviews is that Pakistani members are reluctant to write in Indian board. After all, in Indian board members write in English so its perfectly normal for them to prefer writing in Urdu in their own topic instead.Also, i don't think there is any drawback if the few top active local threads are given the privilege of the local board. 
Imo, the reason why forum staff is reluctant to add new boards is because there's quite a few local boards that eventually became dead/semi-dead. That of course doesn't mean that they shouldn't take a risk from time to time, but I also understand why they are very selective. The activity of Pakistani thread during the past years provides sufficient evidence that it is an active and growing community and deserves its own board. It is highly unlikely that it will become dead or semi dead board , because awareness about block chain technology and interest in crypto currencies is on rise in Pakistan.