I was actually thinking about that idea the other day, and I think it's the perfect way to bring a new hook.
Picture this:
The game becomes an app. It becomes super popular across the entire world, and it's bought by almost everyone. When the time is right, Jumanji sucks all of the people in the world into the game. Then it's up to the kids from the first movie to try and go back as their old characters and save the day.
The thing however is that each of the app users pick one of the game characters. Meaning there will be a lot of Rocks running around in Jumanji. Jumanji 2 made an ungodly amount of money with one Rock. Can you imagine hundreds, thousands, millions of different Rocks in one movie? $1B DOM guraranteed.