As fun as such speculation might be, I don't ever expect anything like the OP's idea regarding skill trees will implemented in this game. There is really no mechanism currently that emulates skill trees, so it would have to be a complete rework of the underlying game to make it work, with absolutely no practical gain for doing so.

After that, I can see the One True Website recommendations becoming meta for each job, so ... what's the point? Glamour is more varied than any skill tree will ever get.