If forthcoming studies show that it evades existing vaccines, is as transmissible as some initial reports suggest, and/or is more severe, all bets will be off. For now, US citizens will still be able to return from those 7 countries after Monday’s travel ban goes into effect.
Also, we’re not guaranteed cold/snow when the PV is in a disrupted state. If it splits on the other side of the globe, we may miss out on the goods while Europe and/or Siberia get blasted. Nothing is black & white.