Some shed the come-hither looks and became stars for other reasons (one thinks of Shelley Winters); some slid into second-leads and Bs before finding roles as character broads (Sheree North).
Some simply disappeared - like Cleo Moore:
Vamping, bad-girling, and cleavage-wrangling kept her fairly busy for a decade or so, but when she left the screen in the late fifties, no one paid her much mind, and frankly, the films themselves don't make a strong case for her as an overlooked phenomenon.
She apparently had a quiet and happy enough private life between the end of her glamour days and her all-too-early death in the mid-70s.
I like to think she spent time like this, looking a little hard and weary but enjoying her garden, thinking of Hollywood, "I miss it; I miss it not; I miss it..."
As with what seems like virtually every performer who ever appeared in a film between 1910 and the late 70s, the Internet has done much to resurrect Moore's reputation, to the extent that her limited oeuvre makes possible.
I suspect that she would be perfectly pleased to be remembered, but not much more than that; behind that platinum hair and imposing frontage, it seems, beat a very sensible heart.
Cleo's portraits come from Brian's Drive in Theater - Thanks!