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Adobe has changed their DRM before, no reason to think they won't again. True they gave folks with content server 3 encrypted books a chance to "upgrade" them to content server 4 encryption, but some folks didn't know about the deadline and can't use their books anymore (unless they have an old device with an old reader activated on it already). So if five years from now there's a content server 5 and you didn't know you could possibly lose access to your books going forward.
Not saying it'll happen, but I don't trust Adobe DRM any more than any other DRM. Theoretically I suppose the B&N/Adobe password (credit card) restricted books are probably the safest 'future proof' DRM, but that still relies on them to provide a reader that will access the books going forward.
The only truly safe book is one with no DRM (or DRM removed) and backed up in multiple locations.
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