The thought that a notable third party or independent Presidential candidate might participate in the 2020 Presidential election is a terrible idea.
It would cause a potential Electoral College disaster, allowing a major party nominee to win with low 40s or high 30s percentage of the popular vote.
So when we hear that former Ohio Governor John Kasich or former Starbucks CEO Howard Schultz is thinking of just that, it is clearly a danger sign that might help Donald Trump or Mike Pence win the next term in the Presidency.
That would be total disaster for the nation, and would take the already downward moral and ethical trend in America to continue, and insure an extremist right wing agenda into the mid 2020s, including a totally extreme right wing Supreme Court and lower federal courts to go on for 30 or more years into the future.
It would also likely make it impossible for the Senate to go Democratic, and for the House of Representatives to remain Democratic, once we had the confusion of a well known third party or independent Presidential candidate siphoning votes, more likely from the Democratic nominee.
While there is no way legally to prevent this, we have to hope that sanity will rule, and we will get a two way race, with all of its attendant shortcomings, rather than the mess that a third serious candidate could bring to the American political system.