Well, I think it's safe to say that the new Ghost mannerisms and voice are not universally loved, some people would have preferred to keep Peter Dinklage, others want a Morgan Freeman or Peter Cullen (Optimus Prime), a few are fans of Noldroid.
I envision a system where we can buy new voices for our ghosts through small and inexpensive DLCs, with a portion of the procedes from each download going as a royalty to the voice actor involved. This would allow Bungie to acquire several big name voices without having to shell out millions of dollars at once.
A list of voices my friends have suggested:
Peter Cullen (Optimus Prime)
Morgan Freeman
Scarlett Johanson
H Jon Benjamin (Archer)
Scott Wilson (Herschel from The Walking Dead)
Stephen Merchant and Ellen McClain (Portal Main Antagonists)
A voice pack would be $5-$10 and would have generic phrases used for future content that wasn't out when the pack was created.