If Jack ever possesses the Key To Vector Sigma again, I am wondering if Megatron will try to capture him and use him to download another copy of the matrix. The Cons could manufacture a container for a new Matrix similar to Prime's. Megatron could capture Jack and threaten to kill his mom or even Arcee if he doesn't do what he says and venture to Cybertron and reload the key. Perhaps Jack goes there and gets the key reloaded, but Megatron is stopped from acquiring it. Perhaps a second Matrix is created and given to another Autobot to become a second Prime since one Prime may not be enough with the Autobots so scattered across the galaxy. Perhaps a Hot Rod character gets it? Or perhaps even a female Autobot named Aerial turning her into Elita One? Or perhaps they place the second Matrix into an evil clone of Optimus producing Nemesis Prime? But I don't think the Matrix will allow itself to be used for evil despite what Megatron thinks.