I think the article is accurate in stating Obama's legacy is crumbling before our eyes. While he was a good president and had a lot of good ideas, he was focused more on building consensus and having a conversation when everyone else was looking for a King-of-the-ring style brawl. This above everything else is what Trump brings to the table and I suspect is his appeal to the American public. 

When Trump takes office, I'm guessing we will  see  a no holds barred, hit-em first, him-em hard style of politics that will not spare Republicans or Democrats if either of them appear to be getting in his way. On a positive note, Trump might actually be more successful than Obama at breaking the partisan divide that has defined American politics because both sides will need to unite to survive Trump.

IMO, Obama's failing is that he tried to bring people together who then used that opportunity to run in the opposite direction and then blame Obama for the failure.