$100M OW wouldn't be anything too substantial imo. At an annual rate of 1.8%, Zootopia's OW will be $83.5M. $100M OW would be only 19.7% higher than Zootopia, an original movie. Given the current tendency of legs, I don't think it can hit a 3× multiplier in 2022.
The number in Australia isnt that bad tbh. It's higher than TS4's, TS3's, Aladdin's, and Minions' OWs, but lower than Incredibles 2's, Dory's, and TLK's OWs. Should hit $30M
Post-second weekend multiplier should be higher with Christmas.
Here are the ratios of post-second weeekend to the second weekend of recent animated films released in November:
The Grinch: 3.72× ($573M)
Ralph Breaks the Internet: 3.21× ($532M)
Coco: 3.62× ($564.8M)
I don't believe F2 will reach any of those multipliers, but 2.5 is way too low.