Seems like it's 1993 all over again.
Maybe I'm just over-thinking this.

5YL: Mon-El gets the new continuity rolling by punching out the Time Trapper.
NOW: Superboy-Prime gets the new continuity rolling by punching out the Time Trapper.

5YL: The entire continuity is reshaped, in order to remove Superboy’s presence in the Legion.
NOW: The entire continuity is reshaped, in order to allow Superman’s presence in the Legion.

5YL: The White Witch, imprisoned on Mordru’s world, is rescued by Laurel Gand.
NOW: The White Witch, imprisoned on Mordru’s world, is rescued by Blok.

5YL: Sun Boy appears to be going over the edge, about to become an evil character. (This doesn't happen.)
NOW: The White Witch appears to be going over the edge, about to become an evil character. (So far this hasn't happened.)

5YL: The sadistic Dominators have infiltrated and taken over UPGov, and the Legion has been outlawed, until the Legion reveals them for what they truly are.
NOW: Sadistic xenophobes have infiltrated and taken over EarthGov, and the Legion has been outlawed, until the Legion reveals them for what they truly are.

5YL: Former Green Lantern Rond Vidar plays a vital role.
NOW: Former Green Lantern Sodam Yat plays a vital role.

5YL: Celeste Rockfish is introduced, with "Green Lantern"-type powers.
NOW: Rainbow Girl is re-introduced, with "Emotional Spectrum"-type powers.

5YL: Dawnstar is brutally maimed, and loses her powers.
NOW: Color Kid is tragically blinded, and loses his powers.

5YL: Blok is pointlessly murdered by Roxxas.
NOW: Double-Header is pointlessly murdered by Earth-Man.

5YL: Shrinking Violet loses a leg in the Braal-Imsk war. She replaces it with a blue Probe leg.
NOW: Polar Boy loses an arm in the Legion-JLE war. He replaces it with a blue ice arm.

5YL: The White Witch is suffering from mental illness due to traumatic stress, and changes her name to Jewel.
NOW: Star Boy is suffering from mental illness due to traumatic stress, and changes his name to Starman.

5YL: Younger duplicates of the several long-time Legionnaires are introduced in Batch SW6, due to a temporal anomaly.
NOW: Younger duplicates of several long-time Legionnaires are introduced as the New Wanderers, due to a parallel-universe anomaly. Unlike 5YL, they are never seen again.

5YL: The Earth, in the Sol system, is destroyed in a technological accident resulting from poor judgment in the past. The Legion helps the inhabitants escape.
NOW: Titan, in the Sol system, is destroyed in a technological accident resulting from poor judgment in the present. The Legion helps the inhabitants escape.

5YL: The Legion is forced by UPGov to accept sociopathic, psychopathic, murdering Khunds into its ranks. They all die, redeeming themselves.
NOW: The Legion is forced by EarthGov to accept sociopathic, psychopathic, murdering Earth-Man into its ranks. He dies, redeeming himself.

5YL: Timber Wolf kills the new super-villain B.I.O.N., despite the fact that B.I.O.N. clearly outpowers him.
NOW: Cosmic King kills new super-hero Variable Lad, despite the fact that by any reasonable interpretation, Variable Lad ought to outpower him.

5YL: Tyroc is re-introduced as President of Earth, but somehow it is still unsatisfying. He then disappears without explanation.
NOW: Tyroc is re-introduced as a top-tier Legionnaire, but somehow it is still unsatisfying. He then disappears into the past, with the rest of the Legion presuming him dead.

5YL: Timber Wolf travels into the past alone, getting his own book. He becomes more wolf-like. The book is cancelled after a short run.
NOW: Timber Wolf travels back into the past with several other Legionnaires, getting their own book. He becomes more wolf-like. The book is cancelled after a medium-length run.

5YL: The Legion is drawn into a battle with between the Time Trapper and Glorith, now re-imagined as a major villain.
NOW: The Legion is being drawn into a battle between the Time Trapper and Glorith, now re-imagined as a new Legion recruit.

5YL: Due to the Zero Hour crossover, there is a major shake-up at DC, the Legion’s universe is severed from the general continuity, all the unresolved plotlines go in the crapper, and current continuity is rebooted.
NOW: Due to the Flashpoint crossover, there is a major shake-up at DC, the Legion’s universe becomes severed from the general continuity, several unresolved plotlines go in the crapper, and the current continuity is (at least partially) rebooted. (i.e. Secret Origins)


“I'm not crazy about reality, but it's still the only place to get a decent meal.” -- Groucho Marx