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The theory of heavily planted aquariums not needing water changes is almost 100% correct. As far as the nitrogen cycle goes, yes you can have an aquarium without ever needing to do a water change. Outdoor ponds do it this way all the time. The difference though is that outdoor ponds rely on rainwater to replenish minerals, where you wont have this in an aquarium setting. However you wouldn't have to do weekly water changes because the fish don't use up minerals THAT fast. I would say to be successful in one of these "Natural" tanks, you would still need a water change every few months.
 
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