China is indeed the most dominant even until now. However, I think their Thomas Cup QF loss last year and their Sudirman Cup silver this year signify the waning of the dominance. With no WS SS title this year, I doubt they could even retain the Uber Cup next year.
One discipline they have extremely excelled in this year though is XD winning 8 of the 12 SS titles plus the SSF. However, XD is also the discipline most affected by injuries to other players. Will be very interesting to see how things play out next year especially once Goh Liu Ying, Choi SolGyu, Yuta Watanabe, and Sapsiree Taerattanachai get back in the mix.