First of all, DisneyGeekBrazil, your English is excellent. There is no need for you to apologize. It is obvious that you have worked very hard to achieve the proficiency which you display.
I'm of the school that there is no such thing as too many dark rides if they are executed properly. DCA needs more, as a dark ride can be enjoyed by the entire family. There are many who do not enjoy thrill rides, thus DCA lops off a good number of their attractions to a certain type of guest. The amount of family attractions is limited in DCA.
I am not impressed with the Little Mermaid attraction and consider it a hair better than the dreaded and departed Superstar Limo. Monsters Inc. is a much better attraction but suffers from a wretched facade and obscure location. We know that Disney can still produce a stellar dark ride. Roger Rabbit is top quality although the loading area is poorly designed.
What would help DCA is a dark ride in the Paradise Pier area, and one of some duration similar to the length of Small World. A Disney take on the classic Fun House would fit theme very well. It could not be a walk through because of crowd control & liability. The proposed gimbaled Omnimover would be a great selection here. There are a good number of redundant stores in the area. Every time that I was back in that area, the storefronts were empty. The footprint of the attraction could be lessened by going to a two story attraction which is fairly common in the midway version of the classic fun house. Again, the gimbaled Omnimover would make this possible.
To be completely honest, I am not a big fan of DCA. I still miss the parking lot.