Sorry to the fan boys out there, but in my opinion the movie makers should try and do whatever it takes to make non comic book fans want to see the movie. A lot of people out there don't read comics because they can't get past the outfits and the impression that they are kids stuff. Most of these hero's, if presented in true replicas of their costumes, would turn the general viewing public off. The movies would then flop and we would miss an opportunity to drag people into our world. =)
Maybe this is the creator in me, but there still aren't enough of "us" to make doing comics a great career path, which means less people are able to quit the day jobs and make the comics we love to read.
I think the shift towards more traditional interpretations of the costumes is a good sign though. It means that the costumed super hero is becoming legitimized amongst the general public. I believe X-men was a necessary step in that process. It introduced people to the characters with minimal susspension of disbelief required. Now we have a general public who look forward to comic movies even though they had never before picked up a comic book, and that audience is even excepting the costumes more easily. That translates to movie adaptions of comics like Thor and Green Lantern. Really think about ten - fifteen years ago. These movies probably would have flopped, and not just because of special effects. Now they do well. You'll probably even be sitting in a theater where comic fans are outnumbered 5-1. In a time where most comic companies are posting losses it's quite possible that these movies are floating the industry through a tough time and creating new readers for the future. This means more potential money for comic creators, and more comics for us.