After thinking a bit more about Vanilla Sky, I have come to this conclusion...

The moral of the story is that if you find a chance at true love you shouldn't fool around with it. (Climb into a car with another woman instead of going home like a good boy, for example) Because NOTHING - not even a sci-fi, futuristic dream machine will bring it back.

So there. Watch the movie. The more I think about it, the more I like it.