I think if the right candidate caught the attention of voters then it would make sense -- someone Barack Obama-like. Then, large numbers of U.S. voters might jump at the chance to help establish a new alternative to the big two parties.

Having said that, though, there is no such candidate on the landscape, so I disagree with you that those who'd like to see a third-party should vote for a third-party candidate in this election. If that happens, then Donald Trump will be more likely to be elected to a second term.

The Republicans will over-whelmingly vote in lockstep for the Republican Party candidate, even if they don't particularly like Trump. Democrats and independents, however, will be tempted to vote for an alternative to the big party candidates, which would weaken the Democratic candidate against Trump. The third-party candidate for which they vote will not have any chance at winning this election.

In 2000, enough voters checked off Ralph Nader on their ballots to tilt the presidency to Republican George W. Bush. Voting for any third-party candidate in 2020 might do the same thing if the election is close.

In the spirit of realpolitik, voters who say they want a third party should not vote accordingly, but should save it for a viable hot candidate in a future election.