I will state something controversial but it has to be said given the current landscape.
If power is to be centralized in the hands of one man in any case, as many in PTI etc. are saying, then I say one thing. The goal should be to turn Pakistan into a forward moving, hard state, and the person at the center of this has to run the ship like the founding fathers of Singapore, Malaysia, and China. Single-minded focus, not one damn bit getting in the way of these national goals and not being bothered by so called democratic chaos.
That is, to use the entire state power to accomplish national goals with no dissension being countenanced. That is, park the niceties aside, revamp the politico-social structure, bring madrassas in-line, operationalize CPEC completely, destroy the regressive industrial/agricultural practices, enforce NAP in entirety, fix the nonsensical degradation in Karachi/open its potential to trade, build the dams for our national survival, enact the defense pact with KSA, solidify military and economic ties with China by safeguarding their investments, put Afg. on notice for BLA/TTP etc. etc.
All of this cannot be done through the chaotic "democracy" veneer that we have had for years now. This would also mean no more "benevolent" behind the scenes rule which is a quasi-military supported "hybrid" dispensation. Perhaps on account of international concerns this facade will have to be managed, but it needs to have real muscle to push hard changes for the foundational restructuring of the country.
We can debate till kingdom come why or why not a representative democracy would be a better choice, my point is simply that since we are already not operating with a representative democracy, we might as well get the benefits of a unified rule without being distracted by the jamhooriat tamasha for the next 5-10 years.