These concerns you mention, concerns which are "real" in the minds of many voters, are based on both real and manufactured, alternative facts. Underlying, however, is a distrust of government that has been very effectively, and ironically, embedded in political discourse by the Republicans and has become pervasive not just among Republican voters but among many Democrats and independent voters as well. This has opened the door for an articulate and charismatic independent candidate, one that can be seen as an"outsider" to "establishment" politics; one that is not associated with the "deep state" -- just as Trump was seen, Should such a candidate arise in 2020, I think they will have a real chance of succeeding, but only if that candidate can garner the full support of the Democratic National Committee and run as a Democrat. We are not yet at that point where a third party candidate can win easily against even a Donald Trump. The Democrats may be in sufficient disarray to allow it, but the Republicans are not.