I have similar fears, reflection is a great thing. When I first heard of the pact I was very happy. But in a weird way now it feels like an entrapment. The other thing which bothers me is the Saudi's always give the US and western nations hard cash for men and material, but for Pak I only ever read about more soft loans, oil facilitates which need to be paid for later.
Maybe there are cash payments going on in the background, but its not being reported or leaked so until it is, this pact longer term could become a drag.