If by "sea change" you mean somethinmg fundamental, there isn't one... just the usual cycle of occasional spasms of saber-rattling interspersed with business as usual. At the end of the day business generally prevails over saber-rattling; it makes more money.
Why? Which side of the peninsula the exercise occurred on makes little difference to the north. In fact the entire exercise makes little difference to the north, just the expected step in a ritual dance. The North Koreans would have been desperately hoping for a US-China confrontation, which would only benefit them, but they didn't get it.
Mountains out of molehills, soon to be forgotten and of no lasting relevance.
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