The only way i'd be happy for this tour to go ahead is if all games were played at Lahore and behind closed doors (small steps at a time).
I'd want similar if not more security to what Kenya had:
The Kenyan team bus, flanked by police, was driven along the route where the attack took place. The visitors will be staying at the National Cricket Academy, adjacent to the Gaddafi Stadium, where all the matches will be played. The security measures put in place include the area being cordoned off by 14 giant gates.
The stadium and the NCA are situated inside the Nishtar Park Sports Complex, which is a public space with several restaurants and shops. During Kenya's stay, however, all the restaurants and shops will be shut for two weeks. Journalists intending to cover the series have had to get their accreditation cleared by the superintendent of police.