It seems to me that the challenge of all learning is integration with what is. I suspect that we apply the term when we are referring to attachments or blockages that inhibit integration. If so, then rather than refer to it as unlearning, we might just use these instances as signals of where to focus our attention to see where integration isn't occurring. This might provide whole new areas of innovation - rather than something so trivial as unlearning.
Intelligence is the underlying organisational principle of the universe.