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.