There is no serious Historian that does not put a minimum of 20 years to have happened "after the fact" on any subject before it can be seen as "historical in nature." Why is that?
I am of the opinion that your assertion is flawed.
Merriam-Webster simple definition of Historian: a person who studies or writes about history
Merriam-Webster simple definition of History: the study of past events. : events of the past. : past events that relate to a particular subject, place, organization, etc.
MacMillan Dictionary definition of Historian: someone who studies or writes about events in history
Oxford English Dictionary definition of Historian: An expert in or student of history, especially that of a particular period, geographical region, or social phenomenon
Oxford English Dictionary definition of History: The study of past events, particularly in human affairs: "medieval European history"
A historian is a person who researches, studies, and writes about the past, and is regarded as an authority on it. Historians are concerned with the continuous, methodical narrative and research of past events as relating to the human race; as well as the study of all history in time. If the individual is concerned with events preceding written history, the individual is a historian of prehistory. Although "historian" can be used to describe amateur and professional historians alike, it is reserved more recently for those who have acquired graduate degrees in the discipline. Some historians, though, are recognized by publications or training and experience. "Historian" became a professional occupation in the late nineteenth century as research universities were emerging in Germany and elsewhere.
No where in any of those definitions of Historian is the time-frame of History itself defined. Major events in world history, say World War II, will have many historians dissecting and writing. The first histories of that event were published in the early 1950's. Not even a decade after.
There are already scholarly papers written about, and a few books as well, the so-called Arab Spring. Most agree that primarily occurred in 2011. A mere blip in time.
The fact is that as soon as an event happens, anywhere, it is immediately in the past. Depending on the import of that event, historians may begin to dissect its effect on the larger world.