The relation between the two nations have worsened a lot, and therefore it is no longer possible to conduct bilateral tours. Also, Pakistan is no longer hosting such tours, and currently the United Arab Emirates is acting as the home ground. But I don't understand how the bad blood between these two nations are impacting the global spread of the game.
Ever since the start of the IPL, India has emerged as the revenue powerhouse of cricket, and more than 70% of the global revenues are derived from the Indian market alone. Now this is a problem for the Pakistanis, as they are no longer allowed to participate in the IPL. There are other T20 leagues out there, such as the BBL and the CPL, but none of them are as lucrative as the IPL.