I think we might get multiple ghost voice actors for two reasons 1: We want it 2: Logically in the world of Destiny every guardian has their own ghost because the ghost brings the guardian back to life they are connected without the ghost the guardian can't respawn and without the guardian the ghost has no meaning for existence(the sad reality) each guardian has his own personal ghost that is his alone always was always will be which leads me to say that each ghost is unique meaning that most likely each ghost has it own voice so the fact that Bungie hasn't already given us multiple ghost voices I kind of odd that would mean there's millions of guardians with the same ghost who picked them up at the same time which means every guardian that currently exists(Us) is actually one guardian all together which would therefore mean us in a singular guardian saved the system several times over from enemies like Atheon, Skolas, Crota, Oryx and Aksis while also creating mental illusions in our own head that we had teammates fighting along with us when in reality us a single guardian did it we killed gods with our hands alone but not alone lololol Basically as of right now there only exists one ghost and one guardian who did every thing we think we did unless bungie corrects this mistake by giving us more ghost voices (because like I said each ghost is unique to its guardian because their connected so the ghosts should each have their own voice) if they do well we can just say that millions of guardians were reseructed at the exact same spot then we can magically fill in our new ghosts voice in our heads with the original Destiny ghost scenes and forget this flusie ever happened