It wouldn’t be breaking records if you include independents like Perot and Anderson
Anderson was running as a Republican in the 1980 primaries. Comparable candidates might be a Jeb! or Ben Carson running as an independent. Perot was well known from his work with the Vietnam War POW/MIA issue. He said he would run as an independent IF his supporters could get his name on the ballot in all fifty states. Which they eventually did. In effect, there was enough unhappiness with Bush 41 and Clinton 42 that Perot was drafted.
Two weeks before the election, I still don't think that most of the American public would identify Gary Johnson as a presidential candidate. Trump, OTOH? I don't know if the comparison has been made that Donald Trump is the Ross Perot who managed to hijack the Republican Party, so I'll make it.
I don't doubt that the Greens + Libertarians may well "break all records" this year. I think we disagree on the margin and the distribution of Johnson and Stein identifiers who vote for Trump, Clinton or stay home.
We'll all see, "in the fullness of time".