As far as a fourth movie. They will be making it, but Shia Labouf won't be in it, nor Megan Fox. Plus one of my friends told me that the entire transformers franchise will end after the fourth movie. (((
No. The very darkest point the franchise has ever seen was in the nineties, after Generation Two bombed without any supporting fiction or interest. And they still revived it under a decade later with Beast Wars, which is to this day considered one of the best examples of a Transformers tv series. And the franchise has been going strong ever since.
All the movies did was bring the franchise back to mainstream view. They injected some life, but the franchise was by no means on life support without it. Plus, they're already planning for the potential of a new trilogy kicked off by TF 4. Transformers is one of Hasbro's biggest cash cows. They won't drop it until there isn't a single cent left to be milked from it.
And as the nineties showed us, they'll still revive it within a few years when they have a new generation to cater to.
The only Predacon I really hope they add in to the show is Grimwing. He's a bit too much like Dreadwing, but hopefully he actually defects to the Autobots. He actually sorta reminds me of Silverbolt or Dinobot. Also, has anyone seen the Go! Combiners? They actually look pretty nice and Brave-ish.
I love the look of those Go! combiners. If I find myself with the cash, those will be ordered without hesitation.