I don't quite understand the objections to Skyrim, or rather it's people, being the Tower. High Hrothgar, or the Throat of the World, isn't sundered or bleeding, they are kingless only by dint of being in Skyrim, and even if the world is about to end, Aegnir pretty much says it's business as usual for them. Would perhaps make sense if you had to obey the Blades, but seeing that you have free choice in that matter, can't see how the prophecy applies, whereas it does to the province and people.