This isn't my idea. Someone else said it in the blog announcing the new Rookies, and I like the idea.
Instead of changing the game, they should make a NEW Big Brother game with the new rules, so we can choose which one we want to play. This way betting won't be affected, and now we might have 2 different types of games to bet on. Maybe the NEW game could use more people, so we could have a choice if we want to play the old way with 10 people or the new way with 14 or so.