Even if your game is indexed, when you update, it may be removed from the index and put back in the review queue.
The best thing you can do is worry about your players and your community, update as needed, and focus on delivering a quality product, promoting yourself, and forget about whether you'll be indexed or not.
I understand that being indexed helps your game be discovered by more people, but because you have no control, or even information, about the indexing process, limiting your work to being indexed isn't the best thing for your current players.