The trouble is, GL is in what might be the worst position of any CBM right now. Back when they announced that there would be a GL Corps movie, it was based on the assumption that BvS would be a huge critical and financial success, and it would be followed up by a very well-received JL film that would break box office records. The opposite happened. BvS made money but didn't hit $1 billion and the film was universally panned. JL was also panned, and it flopped.
And so now here is GL, a property that was already adapted once (and not that long ago) into a critical and financial bomb. WB isn't likely to invest in such a property again, when it can't even seem to get things right with most of its heavy hitters (Superman, Batman, JL). Now, Wonder Woman was great, and if WW2, Aquaman and Shazam are well-received and financially successful, that bodes well for GL, but even that might not be enough. I think it may be a LONG time before we see a GL film, if we do at all. And that sucks.