ok, I'm going to play devils advocate here, but I disagree.
In many 'developing' countries nappies are not an option, so mothers must look for other alternatives. The idea of 'potty training' a baby may seem a little off whack to the 'civilised' world but just because its something we are unaccustomed to, does that make it wrong?
From what I understand from that artical, its less about 'training' your baby to poop & pee on cue in the right place & more about a mother (or father) learning enough about their baby so as to be able to preempt their needs.
Now, lets face it, that is exactly what we parents (or parents to be

) hope to achieve in other areas of our babies care, so is it not a natural progression to extend that to all aspects of our babies care? Do we wait until our babies are crying & screaming to feed them? or do we learn to recognise the signs of an immeniently hungry baby? Do we wait until a baby cries before we try & work out what it wants?
I'm not saying I'm behind it 100 percent. I'm just saying that just because its a concept that we might find unnatural to our way of life, doesn't mean we should cast it aside without giving it some consideration. You could look at it from the other side & ask is it really very natural to wrap a baby in layers of manmade fibres & plastics just so we don't have to deal with the babies waste to such an extent?
I should perhaps point out that personally, I am not going to be following this method, but I am using 100% organic recycled bamboo nappies that are fully washable & 100% biodegradeable. I will be allowing my baby to go 'nappyless' as much as possible around the house & in the garden.