I agree about famous people who get coverage; people pay attention
when Hollywood types go about predicting the end of the world due to
global warming, after all.
An analogy: Snopes covers the most popular email hoaxes because it's a
tool to prevent yourself from believing lies and to cure other people
of their false beliefs. It wouldn't be bad for WT to aspire to
function similarly in disabusing people of faith in their
favorite/unfavorite pundits and predictors.
So what standard do I suggest? How about: everyone with a English
Wikipedia entry is coverable. This is a clear standard, which is even
machine-checkable, and it offloads to the Wikipedia community
(eminently more suitable and interested in assessing the notability of
various persons) labor that isn't useful to WT.
If people are concerned that this might exclude abruptly notable
persons, we can amend it: either an en article, or sufficient media
coverage that the site admins are willing to make an exception.
--
gwern