Bumblebee could be a great start to a reboot, but I accept that there is franchise fatigue in play. So I say give the live action earth stuff a break for a while, then come back in a couple years with a live action earth movie in a new continuity following Bumblebee's story, featuring the new G1 inspired designs. Bring back Knight, Hodson, Steinfeld and Cena and keep it going (but this time properly title it a Transformers and market it as a new continuity, call it Transformers Regeneration or something). But between now and then during the break, do the "animated" movie. Knight talked about a "live action" animated movie in that it would be entirely CG set on Cybertron, but realistic looking like the Cybertron scenes in Bumblebee. Do that first, it'll be easy to market as fresh and new and different than what's been seen before. A whole movie of this before returning to visit Charlie.