The
referendum proposes a switch from a UK style parliamentary democracy to a more US style presidential one.
While generally described in the media as a power grab by the authoritarian Erdogan, that is not necessarily the case.
Proposed new Executive Orders issued by the president would be deemed invalid if they contadicted legislation enacted by the parliament. We have seen this happening recently in the US, where the system provides an effective curb on the president's powers.
The President becomes both the head of state and head of government, with the power to appoint and sack ministers and VP. The president can issue decrees about executive. If legislation makes a law about the same topic that President issued an executive order, decree will become invalid and parliamentery law become valid.
If we had a similar constitutional referendum in Ireland we could make the same switch.
It could result in a more effective government. For example in the Irish Water debacle, the government would not find itself hamstrung in the kind of stalemate in which it now finds itself.
Also, in Ireland's case, it would result in the
separation of powers being improved. In our current system the Taoiseach has effective control of two powers; both the Dail and "the government" (ie both the legislative and the executive powers of the state) while the president is nothing but a figurehead.