"new 787 Dreamliners are about 80% composite's so there has to be some longevity"
Those composites in a plane can be everything from structural members, interior pannels, seats frames, doors, ducting, tanks, toilet seats to exterior panels etc
"Composite" covers an enormous spectrum, where as automotive intakes are a small segment but that specific composite must handle fuel/vapor, hot water/antifreeze, heat/cold, be rigid enough to seal gaskets etc. Obviously with the failures of every blasted marks plastic intakes from BMW to Volvo it is no cake-walk.