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That is the common mistake. Letting go of the dreams without putting enough work to reach them.

However, what happens if you reach the dream and notice it's not what you wanted?

Hmm, maybe I should add the word "model" somewhere in between.

Most dreams are not what we want when realised otherwise we would be happy upon reaching them. No car, house or wife is ever good enough, we always want more. That's why they say be present in the moment because it is really the only place one can ever be satisfied fully because when in the now, there is no expectation of the future nor baggage from the past, meaning all that is, is there now. If that makes sense.