Venezuela already was a refugee crisis ~5 years ago, until they liberalized the economy slightly some years ago. Not sure what the current status is.

I could foresee

* some US-backed pro-business president coming to power * GDP going up * still no completely liberal democracy but anyway better than Maduro * less emigration or maybe people start coming back

The main casualty is the notion that the US follows rules instead of doing whatever it wants. I'm not sure if I'd say democracy is a casualty as well, because (AFAIK with my non-leftist sources) Venezuela wasn't a real democracy.

Spark? Venezuela has already been undergoing a refuge crisis. That crisis is the biggest reason for this invasion, trump hates refugees.