Midwest2: Five million (that’s 5,000,000) more Americans voted that Hillary should not be President than voted that she should be President. So she would not be in. If no one got a majority, as occurred in 2016, in a system where there’s no Electoral College then a runoff (or an “instant runoff” — google that) should occur to determine a winner – since no one won.
And like DY correctly pointed out, if the election had been based on a popular vote then the candidates would have campaigned FAR differently than they did. And the outcome would’ve been much different, and incomparable to the election we had based on the Electoral College. Both candidates would’ve heavily campaigned in deep red and deep blue States rather than only campaigning in swing States.