>From the 7 millions that did show up, very close to zero of them will be deciding the next election due to the way the election system works in the US.

That's not really true. Check the margins of victory in so-called "swing" states (Pennsylvania, Michigan, Wisconsin, Georgia, Arizona, Nevada and North Carolina) for Trump and compare that with each state's turnout at last weekend's protests.

So no. Many more than "close to zero" of those folks will be deciding the next presidential election.

Edit: Corrected prose.