This reminds me of something I encountered recently in the I Ching. It's the 53rd hexagram, Wind over Mountain. This hexagram is often symbolized by trees on top of a mountain. The theme of this hexagram is gradual/steady progress. In order to withstand their exposure to the elements, the trees must remain strong, well proportioned, and firmly rooted.
I believe that the tree in your dream is, in fact, quite the opposite of traditional. I feel safe in saying that a lone oak thriving high on a mountain top doesn't actually happen in nature. And to me this tree is much more a representation of progressive thinking than traditional thinking. Again, going by the I Ching's interpretation of this image I would have to disagree with Sailmrc and say that, perhaps, the dream suggest that you should move toward stability, not away from it. (I don't think this means you should completely stop thinking progressively, but perhaps could benefit you to scale it back a bit)
Ultimately, though, you are the authority on the meaning of your dreams.