The best case scenario is disbanding the decentralized PMU and having a strong centralized military force with a centralized state.
However, that is on paper. In reality disbanding the PMU comes with a huge set of risks, the army is under tight control by our government which gets established by a constitution that favors those whom work on Iraq's failure. PMU removal is favored by the Kurds as it enables them to sabotage the army and execute their plans in the so-called 'disputed territories'. We cannot afford that risk, all we can do is mitigate risks and keep a power balance by keeping the army/ISOF stronger than the PMU in terms of manpower and firepower. Currently that is the case, and it's going to remain that way for many years to come from what it looks like.