That DRM would eventually lead to unusable computer systems. That a completely free software OS was possible. That software patents were bad things. That chasing profit in the LISP machine market would destroy the MIT hacker community. That "look and feel" lawsuits would hurt free software. That a copyleft license would not hurt software adoption by commercial vendors.
You want me to go on? He was on all this stuff (some of it critically important, some of it less so) before, in many cases years before the rest of us caught up.
Let me turn it around then: find something he was verifiably wrong about. There aren't that many cases, and what there are are mostly tactical things (e.g. picking the fight about GNU/Linux was, I believe, counterproductive), not factual ones.
About the increasing restrictions on the tools needed to program generated by the attempt to restrict what you can do with an electronic device. He foresaw the kind of restrictions that appeared both in the iPhone and the german legislation.
Having control over the software that runs on the devices you use to interact with the society of which you are a part is extremely important and the more that computation and networks are used as mechanisms of the state and statelike entities, the more important it gets.
You want me to go on? He was on all this stuff (some of it critically important, some of it less so) before, in many cases years before the rest of us caught up.
Let me turn it around then: find something he was verifiably wrong about. There aren't that many cases, and what there are are mostly tactical things (e.g. picking the fight about GNU/Linux was, I believe, counterproductive), not factual ones.