Disappearance of information based careers

I often imagine that if the information technology such as the internet becomes even more developed as it is today in the future, which will most likely happen, a lot of information based careers might entirely disappear simply because the cost of the access to the information is so low through the internet. For example, real-estate agents will likely loose their jobs if the information about the housing market is available everywhere online. And other less obvious careers, such as doctors and lawyers, may also need some fundamental change.