Interesting Argument:
Does the Internet explain why a certain location or floorplan has held its value better than others? Does the Internet know the soil conditions a neighborhood is built on? Does the Internet know that the kids on the street have been redistricted to a different elementary school four times in the last 5 years?

I think arguing that the problem with the internet is insufficient information flies in the face of the entire history of the network. What keeps the school district or local parents from putting district info up for free? What keeps the local government or civil engineers from putting soil conditions up for free?

But personally, I would no more buy a home without a trusted realtor than I would buy a book without a trusted independent bookstore recommendation or plan a vacation without a trusted travel agent. So unless people figure out how to put those kinds of things online, I think Realtors are safe.