This is a solid decision that will curb abusive searches and help other Fourth Amendment litigation, including ongoing cases involving warrantless cell phone tracking. (That's because many of the concepts about the importance of mobile devices are true in the tracking context as well.)
But it also shows how long it takes for the legal system to fix these problems. I wrote these articles over 7 years ago about how cops in San Francisco and elsewhere were searching phones a decade ago, and the practice has likely been going on for even longer:
http://news.cnet.com/Police-Blotter-Cops-need-warrant-to-sea...
http://news.cnet.com/Police-blotter-Cops-OK-to-copy-cell-pho...
This may be a lesson for HN readers trying to solve privacy problems.
Option #1, enacting a new law, tends to be an exercise in futility: California rejected a fix to cell phone searches in 2011, and Congress did nothing on cell phone searches (nor has it enacted a law to fix warrantless email searches or rein in the NSA post-Snowden).
Option #2, relying on the courts, may work, but it may not. It took 10 years to fix cell phone searches, and only after millions of dollars worth of concerted advocacy by EFF, ACLU, etc. And it might have gone the other way: remember the courts have blessed the erosion of Fourth Amendment protections because of the War On Some Politically Unpopular Drugs.
Option #3, creating technology, works as soon as you can deploy it, and is subject to the laws of mathematics rather than whether a SCOTUS justice is a crankypants today when it comes to privacy. Of course the NSA may try to subvert your encryption/anonymizer/etc., but its attempts may fail, and, besides, intelligence agencies already subverted Congress long ago. :)