The real problem is there is nothing that requires companies to provide continued access to DRM-encumbered media; they can turn it off whenever they want.
In my opinion, if a company can't or won't provide a way for a customer to access their purchased files, then they should be required by law to provide a way for the customer to un-DRM those files.
I would think that the problem is that one of the reasons people like Amazon want to use DRM is to ensure that no DRM free copies of the media exist. One DRM-free copy can multiply into 1 million DRM free copies very quickly.
Of course in reality this is laughably unworkable unless they release a future version of the kindle which requires DRMd media.
In my opinion, if a company can't or won't provide a way for a customer to access their purchased files, then they should be required by law to provide a way for the customer to un-DRM those files.