Stop asking me if I've read this Hollywood Reporter story about Warner Bros. still being hot to make a "Green Lantern" sequel. Just stop.
Does this even rate the need for an explanation? No one "badmouths" their own movie while it's still in theaters with money (theoretically) still to be made; and in today's Hollywood where EVERY genre film is presumed to be the start of a franchise NOT immediately talking sequels is as bad as mouthing can get. They (and the cast/crew) will be saying "Oh, yeah. Sequel. Definitely." for at least another year or two, but the writing is almost-certainly on the wall: The film is a major money-loser and industry-wide joke. Reboot in five or six years with an entirely new cast/crew? Maybe. Sequel? Almost-certainly no.
If you REALLY want to gauge how big a dent "Green Lantern" has put into WB's enthusiasm, watch and see what (if any) kind of movement gets made on his buddies. Warners is still angling for the DC Universe to replace "Harry Potter" as their yearly cash-cow franchise, and "Lantern" was supposed to kick-off a wave of (possibly-connected) DC superhero movies - potentially including an already-mentioned "new" Batman unrelated to the soon-to-conclude "Dark Knight" version and the (for now) one-off "Superman." There's supposedly a completed "Flash" script - they wanted Shawn Levy to direct for awhile - and even freaking "Hawkman" (HAWKMAN!??) is "in development."
Of course, only three months ago Warner's movie group president Jeff Robinov was talking about a "Justice League" movie hitting by 2013 - a logical response to "The Avengers" in 2012. At the time, the "plan" was to spin-out new versions of certain characters (Wonder Woman specifically, as the now-aborted TV show was still happening at that point) introduced therein in their own movies. It's not a bad plan - fans and followers had been suggesting as much since before "Avengers" was even a possibility - but it's concievable that "Lantern" could end up killing any enthusiasm for second-tier characters.