I think that this has the potential to end badly.
We all know that MQM can easily arrange 60k-100k people in a long march (by hook or by crook), and couple this with Minhaj Al Quran's support by the masses, and you are easily seeing at numbers between 140k-200k. People in Pakistan think of a 'maulvi' as a God sent being, and they will blindly follow him.
This might go awry.
My advice to Mr Qadri would be to just keep quiet and return to Canada, elections are going to be held in this year, and let it be. We will see after elections. The country is slowly moving to somewhat a peaceful transition of governments, and Mr Qadri doesn't need to start another 'shosha'.
As for MQM, well they are having the best of both worlds aren't they. They are completely in bed with the PPP, but still are criticizing the government and going on long marches. A bit like the hypocrisy of Shaikh Waqas Akram. But this party does have a real power to gather people, by hook or by crook. There are people in numbers that genuinely support MQM, and then there are poor people who are quietly handed some money and sent to Jalsas. The sector incharge gets a phone call from Altaf Bhai, and gathers a couple hundred/thousand people (depending on location) in no time and is on his way to the Jalsa. MQM is the most organized organization after military IMO. They can coordinate mass movements. After all the judiciary got scared by their call to get 100k people in Isl for the Supreme court case.
This might go into bloodshed if a couple of fanatics get into this, TTP get into this, or somebody in government has a brain lapse.
My take on this, Qadri should just go home