Who knows. There are persistent rumours that silver leased from the ETFs and consumed by industry over the last decade now exceeds the world's physical supply on hand.
Short coverage and physical shortages -> Massive pop in price of silver
Loss of confidence in ETFs -> Massive drop in price of silver (sell-off of ETF -> sell-off of their remaining silver)
And, who knows what happens if ETFs fail (unable to cover redemptions) or those banks heavily exposed in silver market are affected.