We don't need the full source code of all parts of Maemo/MeeGo to continue the support for the Nokia devices. But if Nokia discontinues the distribution of certain files, we can't officially support the devices anymore. We are not legally allowed to redistribute the firmware images for example, so only users that already downloaded the files could reinstall. The same with the Scratchbox SDK. When setting up a new development environment you download binary packages from a nokia server that we are not allowed to redistribute. This is probably also the case with the QtSDK. I don't think we are allowed to redistribute all the files related to Maemo/MeeGo (the emulator images and some simulator files probably). If Nokia stops the distribution of these items, it would make the development of new applications harder. But there are probably a lot more issues when trying to split Maemo.org from Nokia.