"The conceptual gaps are huge, he isn't going to 'see the light' on anything," Robert Daly, who directs the Kissinger Institute on China and the United States at the Wilson Center, said of Xi, adding that it was equally unlikely that Obama would fold on major policy points.
Cybersecurity, which administration officials and press reports drummed up as a major issue before Xi's visit, looks unlikely to yield any important agreements, Daly and other experts told CNBC.
In fact, The New York Times reported that China and the U.S. may unveil some sort of understanding (formal or informal) on not using cyberattacks to cripple each other's critical infrastructure during peace time, but cybersecurity and geopolitical analysts largely said this is a meaningless agreement.
"Taking down critical infrastructure is clearly an act of war," Daly said. "So to say that you're not going to engage in an act of war in peacetime seems a little odd—all's well to have agreements, but this one does not address any of the problems we have now."
At best, any deal will simply resemble a call for restraint, said Jason Healey, a senior research scholar at Columbia School of International and Public Affairs. Any suggestion that a Xi-Obama agreement could reach the level of an "arms control accord," as previous reports deemed, is overly optimistic, he said.
Although he deemed the infrastructure hacking truce a "side deal" to the chief concerns of both countries, Healey said any agreement is a positive step for the relationship.