As long as we have a feckless president - one who is unwilling to exact a cost to Iran, Russia, North Korea, etc., - we can expect a continuation of current events, or worse. This is not hard to figure out.
Obama entered the White House and will leave the White House convinced the United States dominance in the world is a problem - that our presence around the globe has created instability and that United States power and influence must therefore be rendered weakened. He has accomplished his goal.
Of course, we look at the void in US influence created by Obama’s ME policy resulting in the ME now in flames, the resultant Muslim (largely Syrian) migration to Europe (migration w/o the prospect of assimilation) and terrorist activity there and terrorist activity here, Chinese military inspired island building and Russian expansion in territory and influence and N Korea’s continued threats and Iran’s - folks, it’s difficult to find any success.
Couple Obama’s disastrous foreign policy with his restrictive regulatory, near-no growth domestic economy, huge deficits and military cut-backs to unprecedented levels to the point only about 50% of our fighter jets are combat ready and our navy has been shrunk to pre-WW1 levels, not to mention diminished personnel levels and a Veterans Administration that remains significantly unresponsive to the needs of our fighting men and women. Throw in a costly, unworkable domestic medical insurance/delivery debacle - Obamacare.
Add to this witches brew federal corruption at the highest levels of government and federal agencies, such as the FBI/Justice Department and IRS, serving the needs not of the people, but of a constitutionally challenged Obama regime and its prime protégé, Hillary Clinton.
Yes, based on the president’s ability to achieve the goals and objectives of his presidency - to fundamentally change America, I would conclude Obama is one of the most successful presidents in the history of the republic - and the voters elected the son-of-a-bitch TWICE.