Often, we think of gatekeeping being the process by which people are kept away from centers of power and influence to prevent the average person from reaching some goal. Agents and editors are the age old gatekeepers of publishing and entertainment. In my experience, it's more about making sure you and your product are ready to be considered at that next level, and that you're delivering what they're looking for.
Now we see it as just slang for sitting on information or ideas.
Have we lost sight of the job of the gatekeepers, and with the changes in the business, do we still need them? How do we need them to change?