Seems reasonable to me. The advance of technology, indeed, does not necessarily in and of itself create changed expectations in users of that technology vis a vis their own privacy. I am glad to see that old and tired precedents such as Knox are being actually scrutinized in these situations, rather than merely given a pass due to their hoary (in legal terms) age. The world changes, and the law must change with it, and recognize that social patterns are not permanent.
On the other hand, I can see that this decision will not stand long before the glare of the current Supreme Court - Roberts and his merry band of reactionaries (I do not say "fascist" - yet - but "conservative" is far too mild) will make short work of this, sharing their vision of the "original intent" of the Constitution that somehow only removes or limits personal freedoms rather than expanding or protecting them, and granting more and more political control to corporations over individuals. (An exception, of course, is in the area of guns, which are doing untold good in preserving the rights of all those shot.) In particular, Scalia will no doubt be outraged that a mere bit of petty pedantry such as the Fourth Amendment could stand in the way of the constant monitoring and recording of all activities of all citizens and non-citizens - for their own good, of course. I have no time for conspiracy theories, but every bit of information that is revealed about the warrantless wiretaps of Americans (and their overseas conversants) tells me that any confidence in the belief of our own governance is fast passing.
IAAL, and I am sick at heart with the direction of so many recent federal decisions regarding individual and human rights in general that even this bit of common sense shines like a clear sun after a rainstorm, no matter how temporary it may prove to be.
There is no icon for mixed emotions . . .