You know, that’s just narrowminded.
3 Ant-Man are in the comics. With their own supporting characters and stories, and two of them can really open up horizons for the Cinematic Marvel Universe. Hank can give us Wasp and many other scientific properties, including the Microverse. Scott Lang could bring Cassie which would lead to Young Avengers.
Honestly? I think Ant-Man has more going for him than Captain America will after Winter Soldier. (You heard me. It’s not like they would put Diamondback in a film anyways.)