Few things strike me as more politically pathetic than ostensible Progressives who respond to a political defeat by nattering on about leaving the US.
Seriously, what could reek more of privilege than the blithe suggestion that one will be moving to Europe, et al, to escape the consequences of political failure? What percentage of the US population could even consider this as a realistic option? Certainly few of my work mates could. I doubt that many of them even have a passport, other than those who are themselves immigrants. Then there would be the severing of family ties and responsibilities, not to mention the ties of community and culture.
Essentially, such expressions of discontent are nothing less than a threat to abandon the field and one's less privileged allies to the tender mercies of the far right and the Corporados who underwrite them.
The frustration and anger that fuels such ill conceived declarations is understandable and surely most such outbursts aren't serious statements of intent but these sentiments play directly into the stereotypes of the Left that have been grist for the mill of effective RW populist appeals for over three decades. What sensible person could be expected to take advice on the future of the country from those who advertise their readiness to abandon it? Who would trust someone who calls their own level of commitment into question?
Yes I'm aware that you will find similar sentiments in the fever swamps of the far right when things don't go their way but that's hardly a reason to emulate them. We shouldn't be providing them with cover by aping their stupidities.
In a way it's a curiously "American" reaction. The idea of "pulling up stakes" and "moving on" is one of the hoariest tropes of our national myth making. The dream of lighting out to a new country and creating a world of one's own. Always more dream than reality. Very "heroic" and very tickling to the vanity.