Massive. Overnight the calculus has shifted from containment to re-unification. The blue "Peninsula Flag" under which athletes of both nations marched in the Olympics was indeed prescient. Despite its interpretation in NK news broadcasts as a symbol of "autonomous unification". With the historical inevitability of the masses in the south adopting a revolutionary consciousness and being absorbed into the north. Today, we can take it to be a universal symbol of peace.

https://en.wikipedia.org/wiki/Korean_Unification_Flag

Here at home, it gives Trump the necessary political capital going into primary season and the Midterm congressional elections. And perhaps even a shared Nobel. But low key bragging rights may actually belong to Xi. If NK does liberalize, it will be Beijing providing the investment.

"May you live in interesting times" indeed ;)