Who said it was a mistake? Maulana Saad Rizvi?
Yes, on the premise that it serves Pakistan's strategic interest. For your info other ghazi's of ummahn like Turkey, UAE, Saudia Arabia, Qatar etc have/had host huge US military airbase. Some are like small US towns.
And the "boulevard" has been used for 20 years. Not only for logistics but as funnel for combat aircraft like Navy based F-18 Hornets launched from US carriers off the coast of Gwadar to hit targets in Afghanistan. The Americans have maintained alternative routes through Central Asia as way to provide insurance in case Pakistan blocks the route. However the Americans prefer the Pakistan route as it is shortest and within easy reach of their CENTO bases in Gulf Arab countries.
oss is like 20 years late on this 'discovery'. Did you know one of the largest US Marine landings since WW2 took place near a beach in Pasni, Balochistan on the eve of US invasion of Afghanistan. From that staging post US forces went into Afghanistan via helis and aircraft.