Your point would be valid, except the Army interferes with every govt
Sooner or later they come up with some excuse for their latest power grab, and the history of Pakistan shows the evil consequences that follow
Like i said i against it, but it is our own fault that army interferes... now the given scenrio is
Zardari's govt have failed miserably in almost all the fronts, they have done so many blunders in past one year or two that people have been forced to think that if there is any kind of rule of law at all in Pakistan
on the other hand, Kiyani is successfull to re-build the reputation of army by successful operations first in Swat and now in wazistan... this has made people of Pakistan think that it is Kiyani who can rescue them from this un-organized and self-centered govt.
Like NS said, this govt have has great threat from PPPP only, even if today Zardari decides to wakeup to the reality and take some bold decision like sacking the NRO ministers, curbing the hoarders and fighting the corruption with an example, he will win back his popularity... but the attitude he has shown by banning a stupid show and declaring everyone as an actor and conspirator he is not doing any good to his party...
Whenever this kind of govts comes into place, they leave a major power vacum, they leave no choice to people but to encourage army to interfere but again with the style of govt which zardari has demonstrated so far, can you blame army on anyone sacking this corrupt and most expensive govt...
here are few things which zardari can do immediately
1) cut the size of cabinet, get the right people for the right job, and have ministers which have credibility in the public
2) get rid of friends who have name in every other corruption/scandal unviels in Pakistan, get rid of those persons from the govt and his private list who lacks credibility, sacking Raja Pervaiz Ashraf, Rehman Malik, Suleiman Taseer, Qamar uz Zaman kaira, Manzoor Watto, Ahmed Mukhtar and promoting Raza Rabbani, Makhdoom Ameen Faheem, Aitzaz Ehsan etc
3) Get out of the presidential palace and communicate with people, he need to show the image of brave Pakistani, he need to understand that he is more of a president and less of chairman of PPP
above are few, but i guess Zardari's ego won't allow him to do so, and this very thing have laid a foundation of a fragile govt he have in hand