I mean for Gatchaman, I'm not fond of the long angular character designs and faces.
I mean while I wanted to see this get made more than Astroboy, it would've probably made even less money. More mature CG animated action/adventure style movies tend not to do as well. The only one I can think of that is similar that did well was Incredibles but that had the Pixar/Disney branding behind it which is pretty powerful. Plus it was inspired by classic American comics and superheroes. Gatchaman is based on an obscure Japanese anime series with a segmented fanbase. Think about it, very few people in America have actually seen the original version which was Gatchaman. People in America that did watch it when they were kids watched the reversions which were G-Force, Battle of the Planets, and Eagle Riders.