Crazy hold. A Quiet Place dropped 34% in its second weekend and went on to have a 3.7x multi.
Get Out dropped 15% and went on to have a 5.22x multi.
Sure, the drop against Halloween next weekend is sure to be a least a little steeper, but I wouldn't rule out a 4-4.5 multiplier. Especially since this opened a full month before Halloween (the holiday, not the movie), it has an entire 5 weekends to make cash.
By the end of its 5th weekend, Get Out had made 84% of its domestic total. A Quiet Place had made 85% of its total by the end of its 5th weekend. Even if Smile sinks like a rock come November, its run will be close to over anyways.
As long as it doesn't drop something crazy like 60+% next weekend, I would argue that 100M is a fair bet for this.