I can't see Pak as similar to the Middle East countries, as it does have a democratic process, which is hotly participated in, as in India. I expect this Davis affair is more about local politics. However now the Republicans have stepped up their profile in government, it is possible some funding will be delayed.
The main problem is that the Pak government is very aligned with the US, and receives huge funding for their military from the US. Thus they allow US agents almost free rein through the country, and impunity form normal police action. But the population believes that all their trouble comes from the CIA/Blackwater, Mossad, and RAW.
So the politicians have to play a double game, at with Pakistanis are expert. This time however, it appears the Islamists pulled a swifty by getting the wife of one of the murdered Pakistanis to denounce the US on film, then quietly murdering her in a way to make it look like suicide.
It has not helped that the Pakistanis were ISI agents, meaning that this issue runs deeper than popular opinion - likely an attempt by Islamists within the police and ISI to regain control of the political agenda.