That just reshapes the problem rather than altering it though. Once you hit or approach that limit, you're effectively achieving nothing, so should the game allow you to continue on achieving nothing, or should there be a point where it stops and it measures just how well you achieved it? If it lets you continue, then there needs to be something new to hold the interest (which is likely to be a problem with my system). And if it doesn't let you continue, how can it end satisfactorily?