I haven't seen much in the way of specific predictions from Stallman. Basically his "predictions" amount to that closed source software allows corporations and governments to do bad things to users. We fairly regularly see evidence that this is the case, so hurray, the predictions were right. But it's not really a point I've ever heard someone argue against. Pretty much everyone agrees that yes, closed source software makes these bad things possible/easier and sometimes they do happen. Kind of reminds me of all the armchair economists predicting that the tech bubble will burst without ever providing a timeframe.

Anyways, people trot out the "Stallman has consistently been right" thing for every new Stallman article, as if the fact that a guy has made a series of uncontroversial, vague predictions is some sort of defense against the rest of the comments discussing the article's acerbic tone and/or starkly impractical conclusions.