Similar to a has-been
, but without the interval of being genuinely famous between originally being a nobody
and then becoming a nobody again (afterwards).
The term is also sometimes applied to pseudo-celebrities that are used to pad out the roster of guests at TV programs and other events that wanted real celebrities, but couldn't get them.
Sometimes, the never-will-be is deluded enough to think that they truly were famous at some point, and is irritated that they aren't generally treated like the celebrities they feel they should have been.
He's never done anything important enough to be a has-been -- he's a never-will-be.