Re: What villains are left for a 4th film?
If they are lowering the budget as Bay said, we aint getting Unicron, simple as that, personally I now thin Thunderwing would be even more appropriate as he is powerful enough on his own to take on a large group of TF's. They could and should go back to Cybertron for some of it as well.
2017 movie ratings out of 10:
1)Logan-9.5(2)John Wick 2-8(3)Kong: Skull Island-7.5(4)Ghost In The Shell-7