I think hasbro is going to want to the cons to return in a big way. Age of extinction was about autobots and dinobots, I gotta feeling tf5 is gonna be heavy on decepticons and predacons, or combaticons
They get so ambitious when doing new movies that Galvatron may remain as a tiny side story. It might be time to bring in the Bludgeon.
I imagine whoever is left on Earth will be left fighting Galvatron's forces. Who knows what will happen with Optimus when he finds the Chitauri
They mentioned that a few Decepticons were still in hiding. I'm sure we will see some form of actual Decepticon in the future..
Sure, that's something that could definitely happen. However, I hope future films explore what memories or conscious Galvatron holds (considering he's engineered from the heads of both Megatron and Sentinel).
I preferred drones with only 2 real Decepticons in Lockdown and Galvatron. It gave the villains more screen time and character, Lockdown in particular. In 2&3 there were just a bunch of whosits under Megatron and his partner in crime.