It will be a miracle if a census takes place sometime soon. It's been 18 years and counting. The last time a census was held, Nawaz Sharif was Prime Minister in his previous term. That's how long it's been.
We all know what a new census would entail though, more seats for urban areas and fewer seats for rural seats. And new seat boundaries for Provincial Assemblies. Many are against it for these reasons (among others). It's sad that elections are still being held under old, outdated boundaries that no longer correspond to the population.