Stop Using Shampoo?

I read this story which had the following comment on it:

“The simple answer to these problems is to leave your hair to look after itself.It does`nt need all these shampoos,conditioners etc.,they just destroy the natural balance that has taken millions of years to perfect.Cats,rabbits mink and all the other animals with the fur that we humans envy dont use these chemicals to keep clean.The lesson is just wash your hair in warm water,it will take a few weeks to settle down and restore the natural balance of oils but it works and the only losers will be the people who sell this junk.”

Is there any merit to this statement? What would happen if one stopped using shampoo? I asked someone about this and they said that a majority of shampoos have Sulfates which are alkaline and damage hair. This is why we have to follow up with conditioner to restore the natural balance of our hair.

So that makes me tend to believe that the comment was based on sound reasoning.

What do you think?