As the Qianlong Emperor once said, "the Mongol's brothers are his greatest allies, but the Mongol's cousins are his greatest enemies". If the Mongol Empire didn't have such draconian anti-Turkish and anti-Jurchen policies, they may have ended up assimilating to the Turkic peoples they conquered, who had a head start on unifying the Silk Road.
As it was, the Mongolic tribes were so concerned with "purity" that they spent the greater part of a century subjugating and expelling the other Altaic peoples with no compromises and no mercy. Which is why Genghis Khan and the first era of khans are ironically viewed with a lot of negativity in some of West Mongolia's largest cities like Ankara and Samarkand. The Silk Road ultimately wouldn't be revived until 300-400 years after Genghis. But if the First Mongol Empire had been willing to recruit the other peoples of the steppe as allies after their conquest, we might have seen the Silk Road return much earlier.