Anti immigrant/labor candidates like Trump are also not new. The Know Nothing party of the 1850's is a good example. They had nominated former President Millard Fillmore as for President in 1856. I have written about other contemporary politicians like Rick Santorum, Tom Tancredo, and Joe Arpaio.
Where will the current group of candidates end up? That is up to all of us or at least the ones who participate. Many were predicting that Trump and Sanders would both fizzle out in the primaries even as both were . Neither has so far though the Democrats have been somewhat more adept at denying Sanders the nomination.