Yes! I finally reached Puerto Natales! What a never ending journey though! Fortunately the bus driver was a smoker like me and allowed me to have a cigarette with him every now and then in the front cabin. I managed to see Torres del Paine,  Perito Moreno (the day after) and got to Ushuaia 12 hours before my flight. Perfect! A bit hectic but it was all right. I now have five pages of my passport with Chilean and Argentinean stamps.