When it comes to a change in a global effect that will change the game for all players you need a holistic view.
I've found from experience that such changes cause feature creep, and when that happens things get messy.
I spent 4 years as competitive game designer on a triple AAA project, the one element that frustrated players more than anything during our playtests was being punished by the game itself, outside random elements are not appreciated.
I think I've spent enough time on this.
Peace
