I suspect that the number of people who recognize the names of either or have read any of their publications is too small to be of 'significant influence' except during faculty teas (if they still have such things.) 

As you indicated earlier, Sanger's biography now provides the 'sanitized version of her life' extolling her virtues and ignoring her faults.

Rand's novels were stylized representations of an Adam Smith business and corporate ethos and time which never actually existed.  It is as passe' as the little metal collar pins some men had on their shirt collars in the 1950's.  Those and the grey fedora are virtually irrelevant.