“What will most likely happen will be the placement of sniper shooters on the roof tops of sports stadiums in the near future.”
They already do it for the super bowl, but counter-snipers atop a stadium will have a hard time finding and taking out an area-fire sniper who is 3/4 of a mile or greater away.
The sniper only has to hit a stadium-sized target. The counter-sniper has to find and hit a hidden target that is only a few feet square. That’s why I suggest staging marksmen near the police helicopters. They may need to hunt for the sniper.
That is why you have to have an army of snipers, not just one or two.