currency devaluation is a tool export-oriented countries use to make their exports more competitive. Take China for example,
"President Donald Trump has previously accused China of keeping its currency weak to make exports more competitive.
...
Beijing's lack of transparency and the recent weakness of the yuan continued to pose major challenges to achieving "more balanced trade", Treasury Secretary Steven Mnuchin said in a twice-yearly report on the foreign exchange policies of major US trading partners."
If the value of the rupee has fallen, then it's up to Pakistani industry to make up shortfall by increasing productivity and selling more quantity. The nation is supported by a few million expats sending remittances of ~ $20 Billion whereas 200 million people only export ~ $25 Billion. That speaks volumes on productivity in Pakistan. Also, Pakistani people need to get up, get to work, pay taxes. Shortcuts for making money, i.e- bribes and nepotism, lying about income/taxes - have brought Pakistan to its knees.
Imran Khan can get rid of Asad Umer, but
that will NOT solve the current account & fiscal deficits problem you are facing now. The economic policies do not resolve solely around Asad Umer. There are other credible individuals, I consider to be gems and the best of PTI, like Hammad Azhar.
I'm surprised people think Imran Khan should leave. I believe it was Imran Khan that
begged Saudi, UAE, China to bail out Pakistan. He went to Saudi, not once, but TWICE to beg. He drove the GCC princes HIMSELF! Otherwise, none of the GCC countries were coughing up. You are lucky to have a leader who works as hard as a poor man, working horrible conditions, struggling to support his family. Compare this to the past, you should be doing shukr to Allah(swt)!
Lower rupee will make exports more competitive and labor cheaper. If all goes well insha'Allah, that could bring increase investment - open new factories, plants, more jobs. More people will be employed, so people will have more purchasing power to cope with inflation - rising cost of items. This all depends on whether industry can get more exports and whether they have foresight to invest in local capacity to increase production. Also foreign investors setting up plants is a bonus.