Teribus, the Government of Ireland Act 1920 is quite different from the Home Rule Act of 1914 (also called the Government of Ireland Act).

Whether you think the Easter Rising was a success for its leaders' plans depends on what you understand as those leaders' intentions.

The main intention was to gain Ireland a place in the Peace Conference that would follow the war, and press for independence from our long forcible colonisation through that. The second intention was to arouse national spirit so that independence would be gained.

Britain (and America) blocked Irish representation to that Peace Conference.

The War of Independence, and especially the mass disengagement from all British government and civil service, and the construction of a parallel Irish system of government, and the landslide win for independence in the 1918 general election made independence inevitable.