the euro will survive...at least for now. fast forward 20 years and i have no idea. that said, we could easily see a jump either up or down near term with all this volatility, but it's tough to say which set of expectations and constraints are already reflected in the price.
in general, it's best to hold a well diversified portfolio appropriate to your capital/living needs; think stocks (VTI), bonds (BND), real estate (VNQ), metals, commodities, and now crypto assets. that's the general case...when times look especially risky, i like to load some targeted shorts (leveraged short ETFs are expensive and ridiculous to hold long term, but not a bad idea for short term hedging--FAZ, TZA, TECS), write covered calls on stocks, and/or hold larger than usual cash reserves to exploit opportunities.