re: "Start with different requirements and you will end with different solutions."
I have to agree with you. More and more I see ISS as simply a good lesson in how NOT to do a space program. Now that the lesson has been learned its time to scrap it or just give it away to the other nations and move on. Zurbin is right, the ISS is not worth returning the Shuttle to flight nor risking any astronauts for.
As for Hubble, although its gyros may fail in the near future its orbit will not decay for another 15-20 years, plenty of time for a CEV to fly a repair mission to it. Even if its tumbling it will probably be cheaper to find a way to grab it and stablize it then, then the expense of a shuttle mission now.