Once negative interest rates start making their way to savings accounts in major economies more people will start hoarding cash, gold and going into crypto-currencies.
This is a another good reason to invest heavily in BItcoin/basket of the top crypto-currencies. (LTC, DGC, DASH, PPC)
If BTS can address liquidity issues BitUSD and BitGold will look very favourable too, especially with a bond market/old model where you could earn some interest on them. (Especially if cash & gold start being targeted more too.)