As far as numbers go, Karaite Judaism does not, I submit, have anywhere near enough followers to make any real impact in Judaism these days. It is true that the clash between the Karaites and those who followed more normative Judaism centuries ago did result in some helpful innovations (primarily in putting vowels into the Hebrew used in prayers - something that I, not being a native speaker of Hebrew, find necessary to read Hebrew). That said, I believe that the Karaite moment in Jewish history occurred much too long ago to be of serious significance in any contemporary intra-Jewish controversies, and the fact that remaining Karaites have to at least some degree culturally assimilated to the practices of other Jews (at least in Israel, at any rate), in my view, only serves as further validation of my point.