I think in terms of "fair" it doesn't matter what the requirement is as long as it's the same for everyone currently playing a Dynasty. As far as vampires and celebrities, I think they might work out to a wash - vampires limit the spouse pool but the tradeoff is that your vampire best friend isn't going to die at the last minute; celebrity damages relationships but gets you free stuff.
Honestly, I wish we could turn down the setting rather than simply turning it off - fewer vampires but not none, celebrity freebies at a lower chance but less frequent scandals, and paparazzi hanging around less than 100% of the time. Limited to an on/off switch, given my own choice I'd turn off celebrities and leave vampires alone...
(Personally, I'm not concerned about being "fair" to past HoF players who put up with vampires and paparazzi all over the place - every EP has offered new advantages, even if it's just expanding the list of lifetime rewards, skills, and careers....what an advantage the Motive Mobile offered!)