My two part answer for your question....
When everyone is attracted to real estate including lazy people then it may be time to evaluate the market. I don't know that your question is the root issue. I would assume that the root issue is why are so many inexperienced investors attracted to real estate?
The second answer is why wouldn't they be? Who is more intelligent the guy that is paving a road in golden bricks one sweaty brick at a time, or the guy skipping behind him on a nice new path of golden bricks? The inherent issue with developing a successful path in life is that others are going to come behind you and contribute far less work for the same reward. BP throws the gates wide open and welcomes all down that path, while gurus and the like see value in controlling who skips down their path of golden bricks. If you throw the gates wide open then you will get people that will ask you to keep making that path easy for them.
Do you think about the guys who built the bridge that you drive over...probably not, most likely you just wonder why they didn't make the bridge wider. It is just nature for one monkey to see another monkey being successful at fishing ants out of hill with a stick and then emulating that behavior. I doubt the first monkey ever got credit for such a revolutionary idea as fishing ants out of hole with a stick.