What's wrong with Amy Adams? Erin Karpluk (if that's who I assume you're talking about) is hot and a great actress but is an unknown and would be something of a risk to play Lois Lane. Amy Adams is attractive, is a great actress and has name and star power. I don't get your reasoning and think you're just slagging the actress for no particular reason.
Who has star power? Amy Adams? Not more than Erin Karpluk thats for sure. Plus its not the age that makes someone a 'hag', its the look. Diane Lane (the new Martha Kent) is 40+ yet she looks more youthful, vibrant and fresh-faced than Lindsay Lohan who is barely 25. And I certainly don't find Amy Adams attractive.