Though I think some of the thinking given to millenial-generation kids in making them think that they can be what ever they want to be for example an astronaut, is still useful. It's just most people forget about it or give up on that thinking.
The naivety in thinking that you could become an astronaut or something special will probably mean you are more likely to reach your goal or at least go further than other people. I guess if you believe you have the ability to change the world, you probably will.