The public denunciation of Pakistan is for it to "do more" is to keep pressure. The US isn't happy about the pace Pakistan is getting it's act together. But this isn't the 20th century where capturing an enemy's Capital or Army General got you victory.
The is a slow methodical approach. To find the supporters of terrorists in the mist of the government and security forces. Isn't an easy task. These aren't some high school drop outs who post anti-government statuses on social media.
The officers who supported the Taliban and had sympathies are now well into their 40-50s? While the new blood is taking over, having witnessed APS/Lal Masjid, their comrades beheaded, indiscriminate killing of civilians, and international condemnation of Pakistan aren't supporting it anymore. They know the future of Pakistan rests in their ability to remove terrorists from their mists and establish the writ of the government.
This isn't Zia's or Musharraf's Military, active in the government. These guys have signed up, in line to support the civilian government.
You can't just say "Hey all the ISI agents who support the Taliban step into this line."