Have you read the article?
I paste my first comment to someone else on this board:
I suggest you read the entire article thoroughly—quite fascinating.
In reality, there was no longer a need for NATO after the USSR fell, and the organization should have disbanded or significantly wound down most of its operations.
The alliance lost it’s purpose and use. Here we are today.
from the wikipedia NATO page itself:
In the 1990s, the organization extended its activities into political and humanitarian situations that had not formerly been NATO concerns
I did read the article.
I feel that Kennan assumed - mistakenly - that all future Russian leaders would become hardliners like Stalin and Brezhnev.
Instead, if Gorbachev had held onto power, or if Yeltsin had not been an alcoholic, the future of Russia would have been much different.
Without Gorbachev, we would still be dealing with the old Soviet Union.