Why do people think movie 3 is already finished?

I'm seeing a lot of people saying that the movie 3 merch is over with no evidence for it. They deadass think that their most popular and maybe best selling line of figures is going to die after 3 waves. We all thought Prime died, but then they came back for wave 5. It makes no sense to me, why do people think this.

I'm seeing a lot of people saying that the movie 3 merch is over with no evidence for it. They deadass think that their most popular and maybe best selling line of figures is going to die after 3 waves. We all thought Prime died, but then they came back for wave 5. It makes no sense to me, why do people think this.