The coup de grace was administered by those intellectuals who saw that jazz was becoming unpopular and might therefore be Art. This led to 15- minute bass solos, sheets of sound, free jazz and other phenomena that only a musician's mother could love.
Wynton Marsalis may be misguided in trying to breathe life into the old corpse, but at least his heart is in the right place. As for the Lydian mode, I care not a jot - nor the Dorian, Hypophrygian or Paragoric. They don't mean a thing if they ain't got that swing.