Missing Member: Singer Steve Perry, 1998 to present.
Background: A decade after quitting the band and forcing their dissolution, Perry returned to Journey in 1996 to cut their new LP Trial by Fire. It produced a genuine hit with "When You Love a Woman," but Perry injured his hip before they could tour. The band eventually grew tired of waiting for him to heal and went on the road with soundalike Steven Augeri. Vocal problems forced him out in 2006, but they pressed on with replacement singers.
Impact on Reunion: It took them years and endless state-fair and casino gigs to claw their back to the top, but once they discovered Filipino sensation Arnel Pinda on YouTube in 2007 they began headlining arenas again. They're even playing a handful of stadiums this summer on a co-headlining tour with Def Leppard.
Odds of a True Reunion: Very slim. Steve Perry did stand with them onstage at the Rock and Roll Hall of Fame in 2017, but he refused to sing. If that occasion didn't force a reunion, nothing will. Besides, they are doing shockingly well without him.