Any accessory you've purchased is now, obsolete. Any of the I-docks, chargers (car, desk), MBP/MBA link cables etc.
It's a smart business decision for Apple and product producer, as all the Apple failthful will spend.
It just sucks to be a consumer given they've changed the port to a totally new design, which is again outside any other standard that the industry already uses.
If HTC, Samsung or otherwise released a phone with some new proprietary connector that was outside the market and rendered all my connectivity... Useless - I'd refuse to buy it.
But the real sheep are Apple consumers that will just spend again. Apple are very much aware of this given the sales of their products which in many cases are re-hashes of what is already on the market will next to no new features