You make it sound like as if US has become irrelevant in foreign affairs. That is not the case.
Remember this proverb: The world has no permanent friends or enemies, only interests.
US may loose or gain an ally from time to time. That is not our concern.
Our focus should be on how to make our foreign policy competent and extract the most out of it. This is what this article is about.
There is no need to be in the American camp. However, Pakistan should define a clear-cut policy for its relationship with the US. And it should not be restricted to purchase of arms, if we are to make the most out of it.
As for the future, it is uncertain for every state. However, unlike Pakistan, US has a functioning Think Tank that studies the ground realities of the world and offers suggestions accordingly, and the American government can gain insight from those suggestions. One more thing; a normal person like you (or me) have no idea about their plans for the future. It may take us years to realize that Americans were responsible for orchestrating a large number of events across the world and how they suited their interests.