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As much as I hate thinking about the crippling inevitability that all living things eventually die, I know someday Peter Cullen will pass, and the iconic voice of Optimus Prime will be no more. If and when that happens, who would you like to see replace him in the movies?
My money's on Idris Elba. He has that dee booming baritone that's also oddly soothing to listen to, and he could make Prime his own take on the character while still honoring Cullen.
Brendlekirk Cuminbitch is another good choice but he seems to have a more villainous voice desu. He'd make a dope Megatron or Starscream tho.