On the other hand, the Internet makes so many people aware of scams so there is less chance of any particular target falling for it. Of course, some people get so over sensitized to scams that they filter out all legitimate items to thinking it may be a scam.
Scammers also don't need to fool all people some of the time - just some people all of the time. Nigerian Prince Scamming already filters for maximizing gullibility to reduce time wasteage.