Zeon:
The main problem is, that while ISPs could offer free national - the problem is that Telecom Wholesale congestion means that they have to price it otherwise there would be massive congestion (and its already bad enough). Local Content will come, when we start seeing a few CDNs beyond Akamai here you will see. Think about Youtube and ISP caches - half of the videos I watch on Orcon are cached on their Google cache so I can watch them for free at work...
you've really got to stop calling it 'free' national traffic. there is no such thing. cheap perhaps, cheaper than international definately, but free, no. someone has to pay for the infrastructure to get those data packets from invercargill to auckland (or vice versa) and from ISP-A to ISP-B - they dont just magically appear there.