When does originality become common place?

When it becomes the quality standard. If your originality is innovative then it is only logical that others will fallow suit and it then becomes common place. Other set methods such as making wine for example were once innovative. The neccesary components of the wine making process are now set and have become the standard. Now other variables such as soil and certain ingredients (I don't actually know much about wine to be honest but you get the idea) to change flavor give room for originality in something that has become common place.