You have to understand the protests were very much a rural vs urban phenonmenon.
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What you saw on TV was urban people taking to the streets because they believed Deng's reforms failed them. What most observers did not see was the strong support the government enjoyed from the rural people, who made up 80% of the population at the time.
What lends this interpretation of the 1989 movement even more credence is the fact that in almost every major city there were demonstrations, protests, etc. along the lines of those in Beijing, which was really only the tip of the iceberg. But in the countryside? There were crickets. Students and intellectuals may serve as the motivating force behind a revolution, but when it's
aux armes, citoyens time, you'll generally need a bit more support from the unwashed masses. I'm not sure that the attitude of rural dwellers towards the CCP was really one of "strong support"; I'd argue that "benign indifference" was more like it. But now we're just getting into semantics, and it's undeniably true that there wasn't any enthusiasm for revolution in the countryside.
Things could certainly have turned out differently than they did OTL in June 1989, and I don't want to be the one who says, "IMPOSSIBLE! IT CAN'T BE DONE! ASB ASB ASB!" But no matter what happens, I certainly don't see democracy at the end of the tunnel. Reformist elements in the CCP along Zhao Ziyang lines winning power is the most likely divergence, I'd argue.