While the show did come to a pretty definitive conclusion in the series finale, there were still some questions that remained unanswered, and other shows have gotten away with limited series revivals that filled in some blanks from the original run.
This news might be disappointing to fans who were hoping that Jack, Sawyer, and Co. could come back for more action on the small screen.
It would take some time travel/afterlife shenanigans to bring the original Lost characters back; the odds are that the ending will stand as it is and we’ll just have to keep theorizing about those unanswered questions.