I think she would be amazing if she hosted SNL. But I agree, not that many people outside the Broadway circle know who she is. Of course there are other hosts who some people haven't heard of, but then you say "oh he/she was in whichever movie." If you say Kristin was in Bewitched, Deck the Halls, RV, etc, some people might remember, but since she is usually a supporting part, I doubt it.
"For example, if I should paint my fingernails green -
and it just so happens I do paint them green. Well, if anyone should ask me why, I say: 'I think it's pretty!'"