If or when they do make a sequel, should he return? In my opinion hell no Megatron should be dead for good, for god's sake no more resurrections and definitely no rebuilding him as Galvatron. Seriously his character has been dragged through the mud enough, his name tarnished beyond repair. Humiliated time and time again, made a a complete joke of and been the bitch to two different leaders now. He's just an awful, bland character who nobody respects or cares about anymore. Bayverse Megs belongs tucked away in the same draw as Jolt, never to appear or be spoken of again. After the bitter disappointment alot of us had with the Cons in the last few movies. I think a new leader would help mark the beginning of a new era of the Decepticons, almost like a new generation of them. TF4 needs to make the Cons matter again, and change should start at the very top. So either bring in a competely new Con leader who is actually capable of, you know leading his army and doing something, or if they do Galvatron do him as a competely new character unrelated to that pile of scrap metal which is now DOTM Megatron. I just fear Hasbro don't have the balls to leave out someone like Megatron and we will continually see him being brought back just to get his ass kicked again, and the cycle will go on and on.