When BTC is trading at over $1000 all of that "dust" is going to be worth alot. If I can only use BTC to transfer large amounts of cash I would be using it much less than I am now.
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.
How are they going to adjust the dust amount on the fly when BTC are trading at $650 USD on week and $200 USD the next week? Maybe letting miners decide what to include in the block chain instead of hard coding it into the software perhaps? I thought the whole point of this system was to let the market determine what works and to avoid using some human decree as the law of the land.