I mean how much deadly are they, military wise, and their threat level in terms of disrupting the geographical and ideological integrity of pakistan.
Ideologically.
BLA = Marxist [Kaffir]
TTP = Salafist - Rejected by a vast majority of the population.
Militarily.
BLA = 5000 men - not even worth a military scale operation. They can be defeated by FC. No strong recruiting taking place.
TTP = > 10000 men - limited to a geography where they can hide in holes. Their best weapons is using humans as bombtrucks.
Neither of them have the capability to defeat the Pakistani military and the state to cause a breakdown. Only thing they can do is 'bleed the nation', which is not fatal.
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Moral of the story | None of them is a 'critical' threat to Pakistan, either ideologically or militarily. What we need to do is to not alienate our people and seek political solutions, lead by tribes themselves, as they are the ones being affected by the terrorism the most. I believe that strong Jirga lead peace process, backed by the federation and military will end the TTP.
For ending BLA, however we need to work on the economy and jobs, stop our youth from being brainwashed and being used as meat walls against their own country, by banias hiding in Kabul. Solution to the BLA is also political, lead by the Baloch tribes as well as the Pashtuns who are in the majority. The battle against BLA is a battle of hearts and minds as well as carrying out punitive strikes against India.
Peace.