After 18th Amendment, that is the case for pretty much all the political parties. The party supremos hold all the power, if one doesn't tow their line, they are out. MQM will split eventually, that is something that can be delayed but can not be avoided. AH past is finally catching up to him, and he should not be allowed space to maneuver out of this situation. You don't let a snake escape when its cornered, you crush its head.
LEA are fully aware of this, that is why they are dismantling their structure of terror, NO ONE is more important than the state. Its about time to conclude this episode, and besides that fear is the way MQM controls its vote. I am not saying there wont be voting for MQM, but the given the chance you will see other parties getting major chunk of votes.