Making a live-action Deadpool movie, and casting Benedict Cumberbatch as Stephen Strange were simply “good ideas” at first, and then studios decided to run with them.
At this point, there’s no guarantee that a third Teenage Mutant Ninja Turtles movie will follow this narrative; it’s simply a really, really good idea.
That being said, we live in an era where good ideas introduced by filmmakers, actors, and even fans can actually become a reality.
Of course, we have to note that Brian Tee’s comments are not confirmation of any sort.