Yes the partitioning of Iraq would have a positive impact in the region in many ways. The different people of Iraq would likely be separated from each other and this would end that fighting. Also the different religious groups would likely separate as well adding to the stability in the region.
I do not believe partitioning Iraq is likely to have a positive impact in the region because it may not be possible to partition the country in a way to make every group happy. The fractions are fighting over land and each group believes that it has the rights to the land. Partitioning will not solve this, because it assumes giving the land to one of the groups, which would still leaves others upset and willing to fight.