This is the intriguing part of BTC. What will be able to plug into the block chain for authentication purposes? How does that affect future transaction fees as miners make less BTC rewards and want to be compensated for authenticating transactions? Will future price of BTC offset that?
Imagine the knock-on benefit to the economy by making the core of everything, instantly auditable and fraud free. Bring on the fees! As a shopper I've always been happy to pay a premium for quality service/goods - which is what bitcoin offers.