You are quite right that big corps don't like GPLv3, but in my experience that's almost entirely due to patent-paranoia, rather than anything to do with potential changes in new licences. Because GPLv3 is a lot clearer about the fact that they really do have to agree not to assert patent claims on 'anything derived from this' than v2 was. So this problem is actually a side-effect of the whole software-patent disaster rather than much do with changes trying to retain practical user freedoms.
The growing realisation that you can't trust _any_ code you (or someone) can't examine, rebuild and replace, especially if it came from the US, could make a real difference, and shift things back towards copyleft. We shall see. I'd like to think so, but then I already thought copyleft mattered.
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