Traditionally no Exorcist movie beyond the first has been a big moneymaker. "Requels" are the big trend of the moment and supernatural horror has been pretty big the past 10-15 years with Paranormal Activity, The Conjuring, and Insidious proving to be 3 of the biggest horror franchises of the 21st century. But neither of those things guarantee an Exorcist sequel would be a huge success.
The first time anyone tried to make a sequel, it was called "one of the worst horror movies of all time." And Warner Bros. wasted so much money making 2 prequels before. Scrapping an entire $30 million movie when they didn't have faith in it and paying $50 million to make another, only for it to flop as well. Besides the first, only the 3rd has a bit of a cult following. Frankly, it would be naive and a little dumb for them to gamble that much when the franchise hasn't done so great in the past. And I don't think a reputable studio would do something that stupid. I still believe the $400 million is either an Internet rumor that grew out of control or they must have the rights to the entire franchise and its merchandising.
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