If a manufacturer believes that their product benefits from being sold by knowledgeable sales staff to customers, then they should take pains to not let strictly online retailers sell it. If the product is simple and specialized, like in the BMX industry, then online retailers are prettymuch the only way to go.
If I owned a local bike shop I would work hard to carry products that were not being sold online through discount shops.
In some ways, the traditional model needs to be ready to change. I can't add a lot of value to someone's purchase of grips… but things like seats and bars, where people buy the stupidest shit if you don't guide them in the right direction, and obviously more technical things that require mechanical work, benefit from the direct LBS connection.
That all being said, most people I know who are the "fuck bike shops, I'll just buy cheap online because they treat me badly" types are idiots.