When BTC is trading at over $1000, they'll change the rules regarding dust transactions so that it's value is sub-cent again.
Logic.
Sounds a bit like what happened in cypress tbh. I honestly don't think the attraction of bitcoin was that "they" could change the rules as they go.
If that sounds "like Cypress" then you probably need to read more.
Example.
Today in v0.8.2 the default min fee on low priority tx is 0.1mBTC (10,000 S) and thus the dust threshold is 5,430 S.
Current exchange rate ~$100 thus the min fee on low priority tx is ~$0.01 and dust threshold is ~$0.005 (half a penny).
Some day in the future the exchange rate has risen to $2,500 and thus some future version of the client has lowered the min mandatory fee on low priority tx to 0.004 mBTC (400 S). This makes the dust threshold 217 S. The purchasing power of those amounts are still ~$0.01 and $0.005.
Now how exact is that "like Cypress"?