Nevermind the silver standard, anything on the NXT system is dependant on NXT, a for profit venture, surviving. If they go under every asset (fake cryptocoin) attached to it goes down in flames.
Nxt is a decentralised crypto-platform and currency, completely open source with no corporate elements. It was created to offer functionality that BTC simply can't provide.....one thing that Nxt isn't is a for profit venture.
As Nxt is as decentralised as possible, and run on a voluntary basis, it will take a disaster with all crypto to make Nxt fail.
Compare the structures of corporate systems like Ripple or Bitshares to that of Nxt.....see the difference?