It seems to me that little needs to be done, and certainly nothing drastic when a character has proven themselves to be popular. If wanting a change, or to be current with modern culture it would seem better to create something genuinely new. 

The vast majority of movie watchers have never picked up a comic book, and probably never will, so they don't care about the comic book origins of the character.  Those of us who do care already know about them, so its probably smarter for them to focus on the "making of the movie" stuff.

I think the rise in popularity of comic book movies, along with the acquisitions of DC and Marvel by Warner and Disney will ensure the comic book industry continues to exist (its a cheap way for media giants to maintain a stream of source material), but at the same time, it will continue to diminish the quality of material being produced by the "big two,"  because good writers and artists will want to save all of their best ideas for creator owned projects that give them licensing opportunities.

People will still break into the industry through DC and Marvel, but depart once they have made a name for themselves.

Last week I was looking at the new solicitations for Marvel.  I couldn't find anything that interested me (except Black Panther).  There were few creator names I recognized, and the cover art looked bad across the board.

The 'big two' have incredibly popular characters but are limited by the constraints upon them (changes can be made but they will more often be short term gimmicks). It shouldn't stop a writer's ability to tell the best stories that they can though.