ONLY the Shuttle cargo-bay has the capabilities to carry big spare parts (like new modules, new life support systems, solar arrays

The Shuttle retirement, next year, will already have the consequence of a great limitation of the use and upgrade of the ISS, since, without the Shuttle fleet, no new, big, modules can be never added, no big upgrades, no big experiments can be sent to the ISS nor bring back them to Earth and, most important, no big repairs nor replacement of big ISS parts can be done, so, if something too big and and wrong will happen in the next ten years the $200 billion ISS must be ONLY quickly evacuated and, likely, forever!!! After the Shuttle retirement, for over SIX years, all the (american and non-american) ISS crews can be sent to the ISS or bring back to Earth or evacuated (if necessary) ONLY with the russian Soyuz, then, if lucky, from 2016 (+ delays) there should be some government and "commercial" alternatives like the "rescue-Orion", the SpaceX Dragon and other "commercial crew vehicles", but, NONE OF THEM, with the size, the internal space, the cargo and the operational capabilities of a Space Shuttle!!! So, if, after the last Shuttle flight the ISS will have a SEVERE malfunction, in the next six years, that will force the crew to EVACUATE the ISS, could, the ISS, be repaired, later, using ONLY the Soyuz and the Progress? Or, if that will happen after 2016, could, the ISS, be repaired using ONLY the SpaceX Dragon and the Orbital Sciences Cygnus, Pepsi-cans? The answer, to both questions, clearly is a big "NO", since, ONLY the Shuttle cargo-bay has the capabilities to carry big spare parts (like new modules, new life support systems, solar arrays, etc.) to the ISS and ONLY the Shuttle could bring back to Earth big and heavy modules for repair and upgrade.