I think if Man of Steel does well, they could use Ryan Reynolds as Hal Jordan in The Justice League, and people would like the character, because they already know him from the Green Lantern Movie (Despite the fact the movie didn't do well). I don't think people will remember the movie didn't do well, and won't hold it against the character, they'll just remember they know Reynolds as Hal Jordan.
As has been mentioned "The Daddy Issues" were a character arc, so, that wouldn't be used in a next appearance for Reynolds as Hal Jordan, he would pick up where the character was at the end of the movie