While I agree, I'm not sure how much of a transformation happened. If you look at the origins of the CIA, they were about making the world safe for American business pretty much from the beginning. That's not all they did, or do of course. But Allen and John Foster were Wall Street lawyers after all.
The CIA was about having an American intelligence agency suitable to face the challenge of the Cold War: the enormously powerful and dangerous Communist bloc lead by the nuclear armed Soviet Union which was further fortified by the Warsaw Pact nations, Communist China, and the growing number of Communist insurgencies across the world. Trying to explain the CIA as "making the world safe for American business" is silly.
The Communists killed 100,000,000 people in the last century in all manner of cruel tortures, executions, forced starvations, and many other crimes against humanity. Why wouldn't countries want to prevent that from befalling their people? Of course! The real danger is "Wall Street bankers and lawyers!" Please.
The Soviet Story - trailer
Well, you will notice I said they did things other than protect American business interests. That is not their only function, of course. They have a broad range of activities, I'm sure. I am aware of the Cold War, as well.
However, it is not in any way silly to suggest that the CIA does in fact try to make the world safe for American industry. If that were not the case, why did they assist a coup in Iran after President Mosaddegh moved to nationalize the oil industry, taking business away from Western oil companies? Why did they assist a coup in Guatemala when the government there wanted to reclaim land owned by United Fruit? Why did they assist a coup in Honduras when they tried to increase their minimum wage? Ever hear of John Perkins? He has some interesting things to say about what he did on behalf of the CIA and World Bank.
This is all a matter of record. I don't really think it is controversial to say that the CIA protects and advances US business interests. They could do that and fight Communism at the same time. It's not an either/or situation, as you portray it. In fact, from a certain point of view, they dovetail nicely.
And yes, the real danger is in fact Wall Street bankers and lawyers. But that's a different discussion.