I think I read somewhere that those pics of Cage in the Superman suit are not entirely real...that it's his head 'shopped onto a Superman action figure.
I'm very much for keeping Superman's costume the way it's looked for the past 30 or 40 years.
It's not like trying to make it more 'realistic' is going to help those people that may think it's goofy change their minds, and those of us that already accept it well, we already accept it.
A new costume too far from what we've seen in the past 30 to 40 years (I consider the Superman Returns
one as basically the same as the others) would be like New Coke.