The first is that Alito is actually far better than Roberts on privacy rights [1]. Specifically, Alito supports a mosaic theory of the 4th amendment [2] that looks at "whether the government conduct taken over time collects an amount of information that is somehow surprising or unexpected". Alito is actually one of the best hopes for progressive 4th amendment jurisprudence, yet your characterization of him is exactly the opposite!
The second is that blind deference it is not the position of Scalia (though he certainly does support deference to the executive branch when such deference is allowed by law). He is an originalist [3] who faithfully executes that algorithm when he renders his decisions. Just because you don't agree with his point of view doesn't mean he's blindly backing national security agencies. In this situation, Scalia would tell you that what is being done is allowed by law and that Congress can stop it at any time through legislation, i.e. "garbage law in, garbage decision out". He thinks, quite sensibly sometimes, that it is the executive branch's job to deal with national security issues and such issues only become his concern when they violate the law. He is a very capable, if sometimes misguided, jurist.
As to the fact that SCOTUS does not know much about technology, this is an oft argued position that has been thoroughly debunked. Judges have to make rulings on a wide range of technical issues that they are not experts on. This has always been the case, it's not a "wildcard", and the courts are well equipped to handle it. They bring in experts and requests briefs on the necessary subjects. In the last 10 years the Court has ruled on genes, encryption, complex medical procedures, etc. It's impossible for the justices to be experts on all of these. The best we can do is require the justices to be experts on the law and provide them with support from subject matter experts.
[1] http://www.michiganlawreview.org/assets/pdfs/111/3/Kerr.pdf
[2] http://www.volokh.com/2012/01/23/whats-the-status-of-the-mos...
[3] http://nymag.com/news/features/antonin-scalia-2013-10/#print
EDITED to address some comments.