I'll take water changes over chancing bad bacteria colonies along with the good ones you are trying to cultivate to "complete" the cycle.
A weekly water change isn't going to kill me, but a deadly bacteria bloom erupting when I disturb a gravel bed or filter box because I've done something wrong trying to achieve your results juuust might kill my fish.
Remember that a fish tank in the home is a mini-environment. It is near-impossible to replicate nature as it is in the wild in captivity. While this may happen in nature, I have a feeling getting it to occur in my tiny 29 gallon tank would go the way of Jurassic park.. Which is to say, it'd have negative consequences.
Maybe in a larger tank like the OP has? I personally wouldn't mess with it, but to each their own or whatever, right?
Finally, I worry that advice like the OP is giving will give cause to newbie keepers not to water change. We have enough resistance when we tell people that maintaining water quality is important, and a lot of work. For a seasoned keeper who understands the cycle, the OP's suggestion might be manageable, but for someone just starting out I think it'd be dangerous. Confirm/deny?
Yuko, I don't think it's trouble understanding that we're having. You are one person, whose made (as far as I can see) one thread regarding the subject. What's your background? Are you a scientist of some sort? If a fish-keeping journal, or say a major, reputable koi or goldfish breeder, or even a research group posted the findings and backed it up with evidence, evidence, evidence, maybe we'd be more interested.
In the world of academia, you have got to have just about a million and one research sources, you have got to be heavily peer reviewed by others in your field and then you have to be published in a major journal for anyone to give your salt.
You may be onto something, but don't expect a group of PET-fish keepers set in their ways (that have really worked!) to consider changing without an army of proof and information at your side.
It's a little like saying to a parent "Hey, stop feeding your child fruits and veggies, and feed them chocolate at every meal instead! It makes them super smart!". No body's going to believe you without extensive proof, and chances are, few people are going to be ready to experiment for themselves on their kiddos.
I doubt chocolate will revolutionize child-rearing.
Now, you may have the seed of something that could revolutionize fish keeping. Who knows? I'm just not going to experiment on my fish to find out the hard way that it wont work for me.