Archduke Amedeo is actually closer to the throne and 'more important' than his uncle Prince Laurent. His uncle Prince Philippe (the present King) took so long time to get married, that Amedeo already more or less was seen as a future King until Philippe surprised anyone with his engagement to Mathilde d'Udekem d'Acoz.
Line of succession:
HRH Princess Elisabeth of Belgium, the Duchess of Brabant
HRH Prince Gabriel of Belgium
HRH Prince Emmanuel of Belgium
HRH Princess Eléonore of Belgium
HI&RH Archduchess Astrid of Austria-Este née Princess of Belgium
HI&RH Archduke Amedeo of Austria-Este, Prince of Belgium
HI&RH Archduchess Maria Laura of Austria-Este, Princess of Belgium
HI&RH Archduke Joachim of Austria-Este, Prince of Belgium
HI&RH Archduchess Luisa Maria of Austria-Este, Princess of Belgium
HI&RH Archduchess Letitia Maria of Austria-Este, Princess of Belgium
HRH Prince Laurent of Belgium
HRH Princess Louise of Belgium
HRH Prince Nicolas of Belgium
HRH Prince Aymeric of Belgium