The 30-pin connector is one of the longest-surviving connectors on the mobile market, but its clearly past its prime. Apple didn't change the connector just to get $30 extra out of its customers. It was an item on the phones that seriously needed changing if the size and design of the item were to be improved.
He also mentions that in the future Apple will change its dock connector again, throwing accessory makers "under the bus." I highly doubt this will happen. I highly doubt there will even be a "next" connector at all. Given the rate at which technology has progressed, In 11 years (the lifespan of the 30-pin connector) inductive charging will be omnipresent, and AirPlay-esque protocols will be the defacto way to send music between an iDevice and a dock. AirPlay is a software standard and thus can be supported indefinitely, so I imagine any phone that comes out in the future will be backwards compatible with current AirPlay docks.