Finding Nemo 3-D blog

i learned that Film companies make a big profit from converting movies to 3-D, i also learned that there are some 3-D haters, also i learned that 3-D movies are going down hill and will soon be back in the filem companies bag of tricks, i liked that they are making 3-D versions of movie classics such as the lion king, i dont like that 3-D movies are going down hill cause they are fun to watch, my only question is why do they keep making older movies into 3-D instead of making original 3-D Films.