The sign up process would be open to anyone, with or without degrees or training, but it would require enough information and be costly enough that you wouldn't have people send out a fake story get banned, get a new cert, and do it again.
I don't doubt there are people out there who don't "write the news" for a living who would be outstanding journalists and those who do that would get banned for their lack of accuracy.
The idea being that in the past a brand such as the New York Times would carefully manage its journalists such that its content was viewed as accurate and authoritative, it has in the past loudly fired employees who "broke the code". Aggregators like Google and Facebook and Twitter could use the 'newsy score' to trend stories from respected journalists and de-emphasize or spike stories from discredited or non-journalists.