Gothic Architecture replaces the earlier Corvée as the Economic Policy boosting Wonder construction for the Medieval and Renaissance Era. It is arguably much more useful simply because you have more Economic slots in later governments, and consequently - more opportunities to use it. But even more importantly - Wonders from these Eras are some of the most powerful in the game, and include three of the four wonders which add extra slots in any Government (Alhambra for a Military slot, Forbidden City for a Wildcard slot, Potala Palace for a Diplomatic one). So, you are well advised to use this Policy and try to build wonders at this point in the game.