To begin with, I feel, Sufi Mohammad's control over the Swati Taliban was somewhat overrated and overestimated. It was a little too much of an ask, and surely Sufi wasn't up to the task. Some of the points that were agreed upon in the Swat peace deal were;
• The Taliban would recognize the writ of the government and cooperate with security forces;
• The Taliban would halt attacks on barber and music shops;
• The Taliban cannot display weapons in public;
• The Taliban would turn in heavy weapons (rockets, mortars);
• The Taliban cannot operate training camps;
• The Taliban would denounce suicide attacks;
• A ban would be placed on raising private militias;
None of these agreed upon conditions were fulfilled by the Taliban despite Sufi Mohammad's promises. The government on their end did whatever was necessary like allowing the Nizam-e-Adl regulation to be imposed and halting the military operation. Muslim Khan, the Taliban spokesman openly defied the agreement vowing to carry the arms publically. Not just that, Swati Taliban were not only behind the 15th April Charsadda suicide attack killing 15, but they advanced to and took over Buner as well, only to retreat after talks and threat of action by the Army Chief.
Most of the country breathed a sigh of relief after the deal was signed in a hope that peace would finally return in Swat and adjoining areas. But that was not to be. Can an ordinary deal stop the men on divine mission from their duties? I doubt it. Sufi Mohammad still looks like a reasonable man, and reports from areas under his influence aren't that bad either. But his notorious son in law, Maulana Fazlullah, and Swati Taliban cannot be trusted. They can never be trusted. The use of force would be the only way forward, or else their areas of influence would spread.
A positive that has come out of all this 'deal, or no deal' fiasco is that the Swati Taliban have been exposed, and the sympathies, if the had any, in public have dimished. Even people like Nawaz Sharif, Qazi Hussain Ahmad and Imran Khan, who openely supported the deal with Taliban, have now come out in public to denounce them. Now the public, that was earlier against a military action, would support it, which should always be marketed as an option unless Taliban honor the deals like Swat in letter and spirit.