Pakistan cricket board along with the government will give the best security. Whenever there is a schedule between India and Pakistan, the same will be promoted in all possible means. Look at today's match, the ground is full. The host nation is Australia and for its match we can't expect the same crowd. For the betterment of Pakistan cricket, they are in need of hosting Asia Cup. The discussion will not come to an end, and Pakistan won't be hosting the league.
In the end, it comes to security. If countries such as England and Australia are ready to visit Pakistan, then India can't give any excuse other than the lack of permission to do so from the central government. PCB will be in a dilemma. If India doesn't visit Pakistan, then the TV revenues and sponsorship will go down. PCB needs the support from smaller boards and then they should approach the ICC. If BCCI refuses to visit Pakistan, then the latter should claim reimbursement of the losses from the Indians.
this reminds me of Pakistan and NZ match which was supposed to be played in Pakistan - but NZ left the ground that they have security concerns. Many Pakistani believe that there are external forces which don't want to see a stable Pakistan. And they don't want to see Pakistan pressing. In last tournament - when Nz and Pakistan played - the stadium etched with SECURITY SECURITY Chants. If anyone remembers that.