Destiny Was Originally a Third-Person Game
Bungie art director Ryan Ellis told Game Informer that the studio’s upcoming co-op shooter Destiny had been built as a third-person action game, but at some point they decided to make it first person.
“We wanted to make a kick-ass action game, and we decided first-person was the right place to do that,” Ellis said.
Subtext: there simply were not enough first-person shooters out there, and also probably there was marketing pressure from Acti to make a game more apparently in the Bungie wheelhouse. Destiny will probably be pretty good regardless of reasons for making it an FPS, but whatevs.