Hi there,
If you’re already following best practices, I doubt there is anything to worry about. Of course, it’s important to follow along and tweak things if necessary.
As for us, we’re constantly trying to optimize GeneratePress to be better and better. I’m currently working on GeneratePress 3.0 which further minimizes the amount of CSS/JS necessary to run the core theme.
If we continue to do that, we should do just fine with whatever future scores are introduced 🙂