[Boogieman]

They would have to make him fly, because that is the one power that everyone associates with Superman, so the audience would reject any non-flying Supes out of hand nowadays. I do think getting rid of the heat rays/x-rays/superlungs/invincibility is a good idea though. Otherwise, you know that every criminal will be walking around with a pocket full o’ kryptonite, and that is just lame.

[Dr. Sivana]

They would have to make him fly, because that is the one power that everyone associates with Superman,

Agreed. Besides the changes in powers, another reason why I'd like to keep Superman in the pre-War 40s is because his excuse for becomeing a reporter was to know what was happening first, in order to fight crime more effectively. Also, he wasn't expected to be in the office all of the time. Today, the reporters are the LAST to know. Even as far back as the 70s the idea of being a newspaper reporter was stale enough that he was promoted to network anchorman (?! What do you expect from a male boss who uses a cigarette holder?) However, in the early 40s, teh Daily Star/Planet was a reasonable place to be.