Should highly educated, talented and morally upright individuals emigrate to a different country for any life or stay and suffer persecution in order to form a resistance?

In a world that’s becoming more and more globalized, if a country’s best refuse to co-operate with an oppressive regime and gives up middle-class jobs to take on lesser jobs in other countries the brain-drain would eventually bleed the oppressive government. Ideally, over time, some countries will be home to the most dedicated, intelligent, talented people willing to serve the collective good while others, home to the most dysfunctional, corrupt, power-struggling regimes. Should citizens “vote with their feet” or should we continue to think along the lines of “nationalism”?