How do you propose to do that? And what takes their place?
The Hejaz should revert either to the Hashemites or Turkey. The Eastern Province of SA should become an American protectorate. Najd and Asir can revert to the barbarism which is their nature.
FATA and NWFP should, along with Afghanistan, be conquered, occupied, and reconstructed. Baluchistan should be independent, or joined to a Free Iran. The rump Pakistani state (Sind and Punjab) should rejoin India, but could be made a bantustan under US protection if that's easier.