Besides giving grace to those assisting at mass, each valid and reverent Holy Sacrifice of the Mass also brings enormous graces into the world. This acts as actual grace upon people, calling them to conversion and repentance. It is also the force that holds the natural world in order, instead of chaos.
When the mass, and the other sacraments were attacked and changed their efficacy was reduced, and so was the supply of grace to the world. The practice of the faith weakened, less vocations and a diminishment of the priesthood, less masses, (and very few of them pleasing to the Lord in my estimate), less grace for the world.
Without supernatural grace, chaos will reign.
Now just for a moment imagine that you are Satan's strategist, and you want to help him pull as many souls down as you can, what would you advise him to attack? The source of supernatural grace, The Church, and primarily the mass and the priesthood. Without the priesthood no mass and sacraments, without sacraments no grace.
This is exactly what the enemy within the Church has done.
Interesting perspective. Attacked huh? Reduced efficacy? How many NO masses do you think it would take to equal one TLM, in terms of efficacy?