I vote maybe. It just depends on if Peter Cullen will still be in the VA business by the time they're ready for a reboot.
Oh god. everyone is already talking about a reboot. I'd rather 5 inch nails put in my eyes then a reboot. Reboots should only be an option of the franchise crashes and burns. and obviously the bayverse series has done pretty damn well. If I had the choice between a reboot and another 3 movies like Star wars I'd rather that. It's less annoying learning new characters. And any voice Cullen can do the better. His voice is classic.
I voted maybe. Peter Cullen is a good fit for the older, more heroic Optimus Primes, but if they want to go in a different direction with the reboot Optimus, then a different voice actor might work better.