While I can't speak for who's in the right, wrong, or in-between, I can't help but wonder for the future of Destiny's music. This game plans to evolve over a 10 year life-span. Hopefully, whoever will take the reigns of the score will help the music evolve greatly, as well.
Marty is one of the most iconic composers in the game world. But let's not kid ourselves into thinking no one else can make great soundtracks. There was a time that there was no Marty. Maybe the next one is waiting for their big moment, and Destiny 2 is it.
Edit: Hopefully the next guy will also respect Marty's themes and utilize them in new and fresh ways, unlike the train wreck that was the Halo 4 score.