If they did Green Lantern well it could make money, but I think they would have been off choosing a more gritty Lantern rather than Hal, he just doesn't mesh as well with today's audience. And that's a similar problem Superman has
You hit the nail on the head with that word "gritty" because DC never published the "gritty" superhero comic books. Compared to music icons, DC was always the Beatles to Marvel's the Rolling Stones. It was only in relatively recent years that DC began getting even somewhat edgy. People who grew up in the 50s and 60s usually were brand-loyal to either DC or Marvel. I was a DC guy. But now I have to admit, with the exception of Batman movies (and yes, maybe even Green Lantern), the DC heroes and villains come off like cardboard figures next to their edgy, sexy, gritty much more interesting Marvel counterparts.