WARNING: The following contains spoilers for Justice League: Last Ride #1 by Chip Zdarsky, Miguel Mendonca, Enrica Angiolini, & Andworld Design, on sale now.
The world of Justice League: Last Ride is a surprisingly bleak one. Following a mysterious universe-wide Crisis-event, this reality has found itself straining under the resulting pressure. The Justice League's foundation has been shaken by the death of the Martian Manhunter, with the bond between Superman and Batman severely damaged as a result. The United Planets have come together to try and pick up the pieces of the undescribed conflict. Even the New Gods -- some of DC's most powerful beings -- have been removed from play entirely, with Lobo seemingly responsible for slaughtering them.
Perhaps most notably, the Crisis has reduced the Green Lantern Corps to a much smaller number. Hal Jordan has seemingly taken a leadership position away from the Guardians and seeks to make Earth into the new Oa.
Doing so would permanently tie the Green Lantern Corps to the United Planets. Notably, while other elements of the world are different from the core DC Universe of Infinite Frontier, the Green Lanterns share a surprising number of similarities. As predicted in Future State, the Green Lantern Corps has just been thrown into chaos by the mysterious destruction of the Central Power Battery on Oa. The explosion did massive damage to the world and seemingly depowered almost every Green Lantern (save for some unique exceptions, such as Far Sector's Jo Mullein or Young Justice's Teen Lantern). The Lanterns are scattered and depowered just after becoming a part of the United Planets, with the future looking bleak for many of their numbers.
Perhaps Last Ride can be seen as a potential end result of Future State. Future State: Green Lantern and Future State: Justice League both teased Jo Mullein helping restore the Green Lanterns, learning the truth about what happened to Battery and becoming Earth's primary Green Lantern. Perhaps this is because the Lantern Corps -- now reduced in number following the destruction of the Central Power Battery just like in Justice League: Last Ride -- had to restructure, with a statesman of the Corp like Hal or John Stewart at the center. It definitely paints possibly the best-case scenario for the Green Lantern's future, especially given how deadly and destructive things have become for the Corps in the present day.
But there's another element of Hal's plan that ties it closer to another, even grimmer possible future: the one of Kingdom Come, by Mark Waid and Alex Ross. In the world of Kingdom Come, the old guard of superheroes largely retired from active heroics, allowing a more destructive and chaotic generation of crime-fighters to take the scene. Among the retired heroes was this world's Green Lantern -- Alan Scott. Having constructed a floating space station for himself, Scott prepared himself for a war that never came, protecting a world that remained largely unconnected to the ever-developing and ever-changing galaxy around them. Hal's suggestion to make the Moon into a new Green Lantern base harkens to that development, which was a genuinely sad and pathetic role for the Green Lantern to fill.
All of these possible eventualities should be a reminder that the future isn't set in stone, even for one of DC's most powerful heroic armies. In some incarnations of the Legion of Super-Heroes, the Green Lantern Corps had died out in the centuries since the present day. But if anything, Last Ride at least teases an ending for Hal Jordan where he steps up to truly become the greatest Green Lantern and leads them back from the brink. Hopefully, it doesn't end up drawing too many similarities from the fate of Kingdom Come's Green Lantern, though, which would give the Corps a final inglorious ending.