Few there are who understand the significance of this question! Most are not aware of it, but there are no qualified replacements to take her place should she die except the Messiah Himself. I addressed this situation in my Watchman’s Teaching Letter #51, July, 2002 as follows:
You will remember that in the last two Teaching Letters, #49 and #50, I promised to document that Queen Elizabeth II’s husband, Philip, was of questionable blood and how all the children from that union are unfit to take the Throne of David, which the British throne represents. I said the following in lesson #49: “… from the news I notice the queen-mother of England is dead. I’m fully persuaded Elizabeth II is the last pure-blooded descendant of David left to sit on the throne, while Philip Mountbatten and his heirs are of questionable blood presenting prophecy problems.” Then again in lesson #50 I reiterated: “In the last lesson, I briefly mentioned that the queen-mother of Britain had died. I believe that this is a major mile-marker in time as to where we are today on Yahweh’s time-clock. I would remind you that Scripture says in no uncertain terms that there would always be a descendant of David on a throne somewhere until Messiah’s Second Advent. Conceivably, this could mean: if the present Queen Elizabeth II were to have a heart attack and die, and our Redeemer has not returned, the promise to David is a lie and our Bible is untrustworthy. I also pointed out that Queen Elizabeth II’s husband was of questionable blood, and because Elizabeth had taken an unsuitable mate, thus violating Yahweh’s Law of kind after kind, her children by that marriage are unfit to take the throne” (i.e., Shuah vs. Tamar, Gen. 38).