I have not yet read Sand's book but it seems to be that Hok Hashavut cannot apply to foreign Jews from outside coming into Israel if it does not permit palestinians who were ejected in 1948 from returning if they desire. Also, how would demographics alone determine the Jewish character of the state since demographics can and do change? And if these Russians coming in are not deemed Jewish by the rabbinate then how would they be deemed Jewish by the state? Who would be the determiners?
Netanyahu: Most of Americans see eye to eye with Israel on dangers of Iran deal (Haaretz)