Domino theory is specifically about the spread of communism.
Nothing prevents the concept of a falling domino tile resulting in the chain reaction of adjacent tiles falling being applied elsewhere. One example is the dissolution of the Soviet Union and loss of its satellite countries. Another is the Arab Spring.
I'm not sure what your point is? Are you exploring the metaphor of dominos? A poetic exploration of violent ideological spread?
My point is that the term "domino theory" is not an exclusive property of the circumstances in which it was first used. To illustrate this I have mentioned the Arab Spring.
My 1976 copy of the Concise Oxford English Dictionary defines "Domino Theory" as meaning "that political event etc in one place will cause similar events in others, like falling dominoes." If you
search Google for "domino theory definition" the first hit you'll see is: "the theory that a political event in one country will cause similar events in neighbouring countries, like a falling domino causing an entire row of upended dominoes to fall." The
Collins Dictionary defines it as "a foreign policy theory speculating that a political event in one nation will cause similar events in neighbouring nations ".
Merriam-Webster includes this definition: "the theory that if one act or event is allowed to take place a series of similar acts or events will follow".
That would fit the chain of events following the dissolution of the Soviet Union. One by one all members of the Warsaw Pact left the organisation.
Feel free to insist that the expression "domino theory" can only be validly applied to the context in which it was first used, but know this: You're on your own with this insistence.