[inflatable dalek]

To be honest, I don't think there's enough dedicated Transformers fans who will go see each film multiple times to account for a billion dollars. And even if that is somehow mostly down to repeat business, I don't think Paramount will mind if it keeps bringing the money in, even if it's just entirely down to Cliffy going to see the film 10,000,000,000,000 times looking for that elusive Jolt cameo. I think it'll take a movie just doing "OK" at best for them to considering resting the franchise for now.