I've never seen it mentioned in a forum before but at some point at the end of the console (current generation) life, the shop channel will no longer be available, so the option to delete and re-download will not be available. So the need for some other form of storage is really a requirement rather than an option for all those that do not wish to lose a whole load of downloads and cash. The download/delete/download pattern is unworkable in the long term. Wazzy is right, playing directly of the sd card would be the easiest way to sort the problem - surely this could be achieved by some kind of software update?