The EU seems to have a tenuous grasp on even their own member states, now I don't deny there's still a lot of power there, but I don't see them getting even close to the next great superpower, especially with infighting and rampant migrant influx.

My money's on a bolder and more aggressive China as they're more united and more than willing to crush any and all dissent and a smaller, but not insignificant chance of Russia making similar moves. Perhaps even some skirmishes between the two of them. Oh and China might give aid to Pakistan to put pressure on India on two fronts.