Unfortunately most of the books over the next few decades will be written by liberal historians, who applaud his two major achievements in his first term—massively increasing federal spending and getting Obamacare passed. His main goal in his second term (besides continuing what he has been doing) is to destroy the Republican Party. If he succeeds in that, the liberal hosannas will be deafening. It could be a couple of generations before an objective analysis is possible because the historians of the near future (those not old enough to be professional historians now) will have been indoctrinated by liberal pro-Obama teachers while in school.
The victors of any conflict or struggle write the history books.
Look at the thousands of books about Lincoln.
The great majority are written as if he were a beneficent god, even though he presided over the war deaths of 2% of the entire population, with 600,000 Americans dead and another 500,000 wounded.
That's the way it will be for Obama - the popular and accepted history books will ignore the fraud, lies, racism, arrogance and disregard for the constitution. Nor will they mention the corrupt Obama loving media, who are largely responsible for his successes.
The Obama histories will read like something written by Chris Mathews but without the drool and slobber sticking the page together.