Nothing is wrong with these goals per se, but if you place your happiness in their attainment, you are setting yourself up for your own version of these bitter Olympic moments.
Even if you achieve your goal, you are very unlikely to achieve the happiness you're after.
Some researchers have argued that when a goal is a true end point for progress, the cessation of forward motion can lead to a feeling of emptiness, exactly what Shcherbakova described in Beijing.