I think it is wishful thinking to believe you can rid yourself of wishful thinking. Besides who would want to anyway it just takes all the fun out of it.
As long as we realize that our wishful thinking is just that, we should keep it up, so we have some pie in the sky goals, so that even if they never come true, at least we are aiming in the right direction.
If you throw a pie at the sky, it falls back to earth and makes a nasty inedble mess on the ground.